{"id":58235,"date":"2024-01-11T10:27:23","date_gmt":"2024-01-11T03:27:23","guid":{"rendered":"https:\/\/itviec.com\/blog\/?p=58235"},"modified":"2024-01-11T10:27:23","modified_gmt":"2024-01-11T03:27:23","slug":"502-bad-gateway-la-gi","status":"publish","type":"post","link":"https:\/\/itviec.com\/blog\/502-bad-gateway-la-gi\/","title":{"rendered":"T\u1ea5t t\u1ea7n t\u1eadt v\u1ec1 502 Bad Gateway v\u00e0 nh\u1eefng c\u00e1ch kh\u1eafc ph\u1ee5c hi\u1ec7u qu\u1ea3"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">N\u1ed9i dung b\u00e0i vi\u1ebft<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/itviec.com\/blog\/502-bad-gateway-la-gi\/#Gioi_thieu_ve_loi_502_Bad_Gateway\" >Gi\u1edbi thi\u1ec7u v\u1ec1 l\u1ed7i 502 Bad Gateway<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/itviec.com\/blog\/502-bad-gateway-la-gi\/#Loi_502_Bad_Gateway_la_gi_Cac_bien_the_cua_502_Bad_Gateway\" >L\u1ed7i 502 Bad Gateway l\u00e0 g\u00ec? C\u00e1c bi\u1ebfn th\u1ec3 c\u1ee7a 502 Bad Gateway<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/itviec.com\/blog\/502-bad-gateway-la-gi\/#Loi_502_Bad_Gateway_hoat_dong_nhu_the_nao\" >L\u1ed7i 502 Bad Gateway ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/itviec.com\/blog\/502-bad-gateway-la-gi\/#Mot_vai_nguyen_nhan_pho_bien_dan_den_502_Bad_Gateway\" >M\u1ed9t v\u00e0i nguy\u00ean nh\u00e2n ph\u1ed5 bi\u1ebfn d\u1eabn \u0111\u1ebfn 502 Bad Gateway<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/itviec.com\/blog\/502-bad-gateway-la-gi\/#Tac_hai_cua_loi_502_Bad_Gateway\" >T\u00e1c h\u1ea1i c\u1ee7a l\u1ed7i 502 Bad Gateway<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/itviec.com\/blog\/502-bad-gateway-la-gi\/#Lap_trinh_vien_co_the_lam_gi_de_khac_phuc_loi_502_Bad_Gateway\" >L\u1eadp tr\u00ecnh vi\u00ean c\u00f3 th\u1ec3 l\u00e0m g\u00ec \u0111\u1ec3 kh\u1eafc ph\u1ee5c l\u1ed7i 502 Bad Gateway?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/itviec.com\/blog\/502-bad-gateway-la-gi\/#Nhung_viec_lap_trinh_vien_co_the_lam_ngay_tu_dau_de_tranh_502_Bad_Gateway\" >Nh\u1eefng vi\u1ec7c l\u1eadp tr\u00ecnh vi\u00ean c\u00f3 th\u1ec3 l\u00e0m ngay t\u1eeb \u0111\u1ea7u \u0111\u1ec3 tr\u00e1nh 502 Bad Gateway<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/itviec.com\/blog\/502-bad-gateway-la-gi\/#Nhung_cau_hoi_502_Bad_Gateway_thuong_gap\" >Nh\u1eefng c\u00e2u h\u1ecfi 502 Bad Gateway th\u01b0\u1eddng g\u1eb7p<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/itviec.com\/blog\/502-bad-gateway-la-gi\/#Tong_ket_502_Bad_Gateway_la_gi\" >T\u1ed5ng k\u1ebft 502 Bad Gateway l\u00e0 g\u00ec<\/a><\/li><\/ul><\/nav><\/div>\n<p><b><i>L\u1ed7i 502 Bad Gateway l\u00e0 m\u1ed9t trong nh\u1eefng l\u1ed7i th\u01b0\u1eddng b\u1eaft g\u1eb7p nh\u1ea5t trong qu\u00e1 tr\u00ecnh duy\u1ec7t web. 502 Bad Gateway khi\u1ebfn vi\u1ec7c truy c\u1eadp trang web b\u1ecb gi\u00e1n \u0111o\u1ea1n v\u00e0 g\u00e2y kh\u00f3 ch\u1ecbu trong tr\u1ea3i nghi\u1ec7m s\u1eed d\u1ee5ng c\u1ee7a ng\u01b0\u1eddi d\u00f9ng, do \u0111\u00f3, c\u00e1c l\u1eadp tr\u00ecnh vi\u00ean c\u1ea7n \u0111\u01b0\u1ee3c trang b\u1ecb ki\u1ebfn th\u1ee9c \u0111\u1ea7y \u0111\u1ee7 v\u1ec1 l\u1ed7i n\u00e0y \u0111\u1ec3 c\u00f3 th\u1eed x\u1eed l\u00fd m\u1ed9t c\u00e1ch t\u1ed1i \u01b0u nh\u1ea5t.<\/i><\/b><\/p>\n<p><span style=\"font-weight: 400;\">Trong b\u00e0i vi\u1ebft n\u00e0y, b\u1ea1n s\u1ebd \u0111\u01b0\u1ee3c t\u00ecm hi\u1ec3u v\u1ec1:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">\u0110\u1ecbnh ngh\u0129a v\u00e0 c\u00e1c bi\u1ebfn th\u1ec3 c\u1ee7a 502 Bad Gateway<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Nguy\u00ean nh\u00e2n g\u00e2y ra 502 Bad Gateway<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">T\u00e1c h\u1ea1i c\u1ee7a 502 Bad Gateway<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">C\u00e1ch kh\u1eafc ph\u1ee5c v\u00e0 tr\u00e1nh l\u1ed7i Bad Gateway<\/span><\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Gioi_thieu_ve_loi_502_Bad_Gateway\"><\/span><b>Gi\u1edbi thi\u1ec7u v\u1ec1 l\u1ed7i 502 Bad Gateway<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">M\u1ed7i khi b\u1ea1n truy c\u1eadp m\u1ed9t trang web, tr\u00ecnh duy\u1ec7t c\u1ee7a b\u1ea1n s\u1ebd g\u1eedi y\u00eau c\u1ea7u \u0111\u1ebfn m\u00e1y ch\u1ee7 web. M\u00e1y ch\u1ee7 web nh\u1eadn v\u00e0 x\u1eed l\u00fd y\u00eau c\u1ea7u, sau \u0111\u00f3 g\u1eedi l\u1ea1i c\u00e1c t\u00e0i nguy\u00ean \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u c\u00f9ng v\u1edbi ti\u00eau \u0111\u1ec1 HTTP v\u00e0 m\u00e3 tr\u1ea1ng th\u00e1i HTTP. Th\u00f4ng th\u01b0\u1eddng, m\u00e3 tr\u1ea1ng th\u00e1i HTTP s\u1ebd kh\u00f4ng \u0111\u01b0\u1ee3c nh\u00ecn th\u1ea5y tr\u1eeb khi c\u00f3 s\u1ef1 c\u1ed1. V\u1ec1 c\u01a1 b\u1ea3n, \u0111\u00f3 l\u00e0 c\u00e1ch m\u00e1y ch\u1ee7 th\u00f4ng b\u00e1o cho b\u1ea1n r\u1eb1ng \u0111\u00e3 x\u1ea3y ra s\u1ef1 c\u1ed1, c\u00f9ng v\u1edbi m\u00e3 v\u1ec1 c\u00e1ch ch\u1ea9n \u0111o\u00e1n s\u1ef1 c\u1ed1.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">M\u1ed9t trong nh\u1eefng l\u1ed7i HTTP th\u01b0\u1eddng g\u1eb7p khi duy\u1ec7t web ch\u00ednh l\u00e0 <strong>502 Bad Gateway<\/strong>. \u0110\u00e2y l\u00e0 m\u1ed9t trong nh\u1eefng l\u1ed7i ph\u1ed5 bi\u1ebfn m\u00e0 L\u1eadp tr\u00ecnh vi\u00ean c\u1ea7n hi\u1ec3u r\u00f5 \u0111\u1ec3 t\u00ecm ra h\u01b0\u1edbng kh\u1eafc ph\u1ee5c ph\u00f9 h\u1ee3p.<\/span><b><\/b><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Loi_502_Bad_Gateway_la_gi_Cac_bien_the_cua_502_Bad_Gateway\"><\/span><b>L\u1ed7i 502 Bad Gateway l\u00e0 g\u00ec? C\u00e1c bi\u1ebfn th\u1ec3 c\u1ee7a 502 Bad Gateway<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">L\u1ed7i Bad Gateway 502 l\u00e0 l\u1ed7i ph\u00eda m\u00e1y ch\u1ee7 cho bi\u1ebft m\u00e1y ch\u1ee7 proxy b\u1ea1n \u0111ang s\u1eed d\u1ee5ng \u0111\u1ec3 k\u1ebft n\u1ed1i v\u1edbi m\u00e1y ch\u1ee7 web kh\u00e1c \u0111\u00e3 nh\u1eadn \u0111\u01b0\u1ee3c ph\u1ea3n h\u1ed3i kh\u00f4ng h\u1ee3p l\u1ec7. \u0110i\u1ec1u n\u00e0y x\u1ea3y ra khi m\u00e1y ch\u1ee7 web \u0111ang \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng l\u00e0m c\u1ed5ng \u0111\u1ec3 t\u00ecm n\u1ea1p d\u1eef li\u1ec7u b\u1ea1n c\u1ea7n \u0111\u1ec3 t\u1ea3i trang t\u1eeb m\u00e1y ch\u1ee7 g\u1ed1c.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">L\u1ed7i Bad Gateway 502 l\u00e0 m\u1ed9t lo\u1ea1i m\u00e3 tr\u1ea1ng th\u00e1i HTTP. C\u00e1c m\u00e3 tr\u1ea1ng th\u00e1i HTTP n\u00e0y \u0111\u01b0\u1ee3c m\u00e1y ch\u1ee7 c\u1ea5p khi b\u1ea1n \u0111\u01b0a ra y\u00eau c\u1ea7u, v\u00ec v\u1eady n\u1ebfu hi\u1ec3u \u00fd ngh\u0129a c\u1ee7a c\u00e1c m\u00e3 \u0111\u00f3, b\u1ea1n c\u00f3 th\u1ec3 gi\u1ea3i m\u00e3 l\u1ed7i v\u00e0 kh\u1eafc ph\u1ee5c s\u1ef1 c\u1ed1 d\u1ec5 d\u00e0ng h\u01a1n.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">C\u00e1c lo\u1ea1i m\u00e3 tr\u1ea1ng th\u00e1i HTTP l\u00e0:<\/span><\/p>\n<table>\n<tbody>\n<tr>\n<td><b>M\u00e3<\/b><\/td>\n<td><b>Lo\u1ea1i<\/b><\/td>\n<td><b>\u00dd ngh\u0129a<\/b><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">100<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Th\u00f4ng tin (Informational)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">M\u00e1y ch\u1ee7 \u0111\u00e3 nh\u1eadn \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u c\u1ee7a b\u1ea1n v\u00e0 \u0111ang x\u1eed l\u00fd th\u00eam<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">200<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Th\u00e0nh c\u00f4ng (Success)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Y\u00eau c\u1ea7u c\u1ee7a b\u1ea1n \u0111\u00e3 \u0111\u01b0\u1ee3c ho\u00e0n th\u00e0nh v\u00e0 tr\u00ecnh duy\u1ec7t \u0111\u00e3 nh\u1eadn \u0111\u01b0\u1ee3c ph\u1ea3n h\u1ed3i t\u1eeb m\u00e1y ch\u1ee7<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">300<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Chuy\u1ec3n h\u01b0\u1edbng (Redirection)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Cho bi\u1ebft m\u00e1y ch\u1ee7 c\u1ea7n th\u1ef1c hi\u1ec7n m\u1ed9t h\u00e0nh \u0111\u1ed9ng kh\u00e1c, ch\u1eb3ng h\u1ea1n nh\u01b0 chuy\u1ec3n h\u01b0\u1edbng 301, m\u00e0 b\u1ea1n c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng \u0111\u1ec3 \u0111\u1ecbnh tuy\u1ebfn l\u1ea1i URL \u0111\u1ebfn m\u1ed9t trang \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt tr\u00ean trang web c\u1ee7a m\u00ecnh<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">400<\/span><\/td>\n<td><span style=\"font-weight: 400;\">L\u1ed7i m\u00e1y kh\u00e1ch (Client Error)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Y\u00eau c\u1ea7u kh\u00f4ng h\u1ee3p l\u1ec7. \u0110i\u1ec1u n\u00e0y x\u1ea3y ra khi kh\u00f4ng th\u1ec3 truy c\u1eadp \u0111\u01b0\u1ee3c m\u1ed9t trang ho\u1eb7c trang, ch\u1eb3ng h\u1ea1n nh\u01b0 l\u1ed7i kh\u00f4ng t\u00ecm th\u1ea5y trang 404<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">500<\/span><\/td>\n<td><span style=\"font-weight: 400;\">L\u1ed7i m\u00e1y ch\u1ee7 (Server Error)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Cho bi\u1ebft y\u00eau c\u1ea7u c\u1ee7a b\u1ea1n h\u1ee3p l\u1ec7 nh\u01b0ng c\u00f3 v\u1ea5n \u0111\u1ec1 \u1edf ph\u00eda m\u00e1y ch\u1ee7. \u0110\u00e2y l\u00e0 lo\u1ea1i l\u1ed7i 502 r\u01a1i v\u00e0o, c\u00f9ng v\u1edbi l\u1ed7i 500 ph\u1ed5 bi\u1ebfn cho bi\u1ebft s\u1ef1 c\u1ed1 d\u1ecbch v\u1ee5 n\u1ed9i b\u1ed9<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span style=\"font-weight: 400;\">L\u1ed7i Bad Gateway 502 c\u00f3 th\u1ec3 kh\u00f4ng ph\u1ea3i l\u00fac n\u00e0o c\u0169ng xu\u1ea5t hi\u1ec7n gi\u1ed1ng nhau. C\u00f3 nhi\u1ec1u phi\u00ean b\u1ea3n kh\u00e1c nhau c\u1ee7a th\u00f4ng b\u00e1o l\u1ed7i 502, bao g\u1ed3m c\u1ea3 m\u00e0n h\u00ecnh tr\u1eafng tr\u1ed1ng. M\u1ed9t s\u1ed1 ph\u1ed5 bi\u1ebfn nh\u1ea5t bao g\u1ed3m:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">502 bad gateway<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">502 server error<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Error 502<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">502 Server Error: The server encountered a temporary error and could not complete your request<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Bad Gateway: The proxy server received an invalid response from an upstream server<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">HTTP Error 502 \u2013 Bad Gateway<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">502 proxy error<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">502 Service Temporarily Overloaded<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">HTTP 502<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Temporary Error (502)<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">T\u1ea5t c\u1ea3 c\u00e1c bi\u1ebfn th\u1ec3 n\u00e0y \u0111\u1ec1u d\u1eabn \u0111\u1ebfn c\u00f9ng m\u1ed9t l\u1ed7i 502. B\u1ea1n nh\u1eadn \u0111\u01b0\u1ee3c th\u00f4ng b\u00e1o n\u00e0o t\u00f9y thu\u1ed9c v\u00e0o tr\u00ecnh duy\u1ec7t web v\u00e0 web server.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Loi_502_Bad_Gateway_hoat_dong_nhu_the_nao\"><\/span><b>L\u1ed7i 502 Bad Gateway ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o?<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">\u0110\u1ec3 hi\u1ec3u \u0111\u01b0\u1ee3c c\u00e1ch ho\u1ea1t \u0111\u1ed9ng c\u1ee7a l\u1ed7i 502 Bad Gateway, b\u1ea1n c\u1ea7n ph\u1ea3i hi\u1ec3u ki\u1ebfn th\u1ee9c v\u1ec1 Giao th\u1ee9c truy\u1ec1n si\u00eau v\u0103n b\u1ea3n (HyperText Transfer Protocol &#8211; HTTP).<\/span><\/p>\n<p><span style=\"font-weight: 400;\">N\u00f3i m\u1ed9t c\u00e1ch ng\u1eafn g\u1ecdn, HTTP l\u00e0 giao th\u1ee9c <\/span><b>l\u1edbp \u1ee9ng d\u1ee5ng<\/b><span style=\"font-weight: 400;\"> cho m\u00f4 h\u00ecnh <\/span><b>b\u1ed9 giao th\u1ee9c Internet<\/b><span style=\"font-weight: 400;\"> \u0111\u1ec3 s\u1eed d\u1ee5ng trong c\u00e1c h\u1ec7 th\u1ed1ng th\u00f4ng tin si\u00eau ph\u01b0\u01a1ng ti\u1ec7n.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u0110\u1ecbnh ngh\u0129a tr\u00ean s\u1ebd d\u1ec5 hi\u1ec3u h\u01a1n n\u1ebfu b\u1ea1n hi\u1ec3u r\u00f5 t\u1eebng th\u00e0nh ph\u1ea7n:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\"><strong>\u201cL\u1edbp \u1ee9ng d\u1ee5ng\u201d (Application layer)<\/strong> \u0111\u1ec1 c\u1eadp \u0111\u1ebfn c\u00e1c l\u1edbp tr\u1eebu t\u01b0\u1ee3ng m\u00e0 ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1ec3 thao t\u00e1c v\u00e0 s\u1eed d\u1ee5ng. B\u00ean d\u01b0\u1edbi l\u1edbp tr\u1eebu t\u01b0\u1ee3ng n\u00e0y ch\u00ednh l\u00e0 h\u1ec7 th\u1ed1ng code back-end.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\"><strong>\u201cB\u1ed9 giao th\u1ee9c Internet\u201d<\/strong> hay <strong>Giao th\u1ee9c \u0111i\u1ec1u khi\u1ec3n truy\u1ec1n t\u1ea3i\/Giao th\u1ee9c Internet (TCP\/IP)<\/strong> l\u00e0 m\u1ed9t t\u1eadp h\u1ee3p c\u00e1c h\u1ec7 th\u1ed1ng v\u00e0 quy t\u1eafc \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong vi\u1ec7c truy\u1ec1n d\u1eef li\u1ec7u qua internet. C\u00e1c h\u1ec7 th\u1ed1ng v\u00e0 quy \u0111\u1ecbnh n\u00e0y x\u00e1c \u0111\u1ecbnh c\u00e1ch m\u1ed7i quy tr\u00ecnh ph\u1ea3i \u0111\u01b0\u1ee3c ch\u1ea1y v\u00e0 cung c\u1ea5p ph\u01b0\u01a1ng ph\u00e1p truy\u1ec1n d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c ti\u00eau chu\u1ea9n h\u00f3a m\u00e0 b\u1ea5t k\u1ef3 ai c\u0169ng c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Nh\u01b0 v\u1eady, Giao th\u1ee9c truy\u1ec1n si\u00eau v\u0103n b\u1ea3n, hay HTTP, l\u00e0 giao th\u1ee9c c\u1ea5p n\u1ec1n t\u1ea3ng \u0111\u1ec3 truy\u1ec1n internet. HTTP \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng b\u1edfi m\u1ecdi c\u00f4ng ty c\u00f3 t\u01b0\u01a1ng t\u00e1c v\u1edbi internet, d\u00f9ng \u0111\u1ec3 truy\u1ec1n d\u1eef li\u1ec7u gi\u1eefa c\u00e1c m\u00e1y ch\u1ee7 v\u00e0 hi\u1ec3n th\u1ecb th\u00f4ng tin Ng\u00f4n ng\u1eef \u0111\u00e1nh d\u1ea5u si\u00eau v\u0103n b\u1ea3n (HTML) trong giao di\u1ec7n \u0111\u1ed3 h\u1ecda m\u00e0 ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Vi\u1ec7c tri\u1ec3n khai HTTP s\u1eed d\u1ee5ng c\u00e1c c\u1ed5ng ho\u1eb7c \u0111i\u1ec3m cu\u1ed1i chuy\u00ean d\u1ee5ng \u0111\u1ec3 \u0111i\u1ec1u khi\u1ec3n lu\u1ed3ng th\u00f4ng tin. Th\u00f4ng th\u01b0\u1eddng, c\u1ed5ng 80 s\u1ebd \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 truy\u1ec1n d\u1eef li\u1ec7u kh\u00f4ng \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a, c\u00f2n c\u1ed5ng 443 s\u1ebd \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 truy\u1ec1n d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a. D\u1eef li\u1ec7u s\u1ebd \u0111\u01b0\u1ee3c truy\u1ec1n qua c\u00e1c c\u1ed5ng gi\u1eefa m\u00e1y ch\u1ee7 l\u01b0u tr\u1eef d\u1eef li\u1ec7u v\u00e0 thi\u1ebft b\u1ecb y\u00eau c\u1ea7u d\u1eef li\u1ec7u.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">HTTP ho\u1ea1t \u0111\u1ed9ng tr\u00ean m\u1ed9t h\u1ec7 th\u1ed1ng c\u00e1c th\u00f4ng b\u00e1o theo d\u1ea1ng \u201cy\u00eau c\u1ea7u &#8211; ph\u1ea3n h\u1ed3i\u201d. V\u1ec1 c\u01a1 b\u1ea3n, m\u00e1y t\u00ednh c\u1ee7a b\u1ea1n s\u1ebd y\u00eau c\u1ea7u d\u1eef li\u1ec7u t\u1eeb m\u00e1y ch\u1ee7 v\u00e0 vi\u1ec7c g\u1eedi l\u1ea1i d\u1eef li\u1ec7u ch\u00ednh x\u00e1c l\u00e0 t\u00f9y thu\u1ed9c v\u00e0o m\u00e1y ch\u1ee7.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Ch\u00ednh v\u00ec th\u1ebf, khi m\u00e1y t\u00ednh c\u1ee7a b\u1ea1n t\u1ea3i m\u1ed9t trang web, m\u1ed9t y\u00eau c\u1ea7u v\u1edbi n\u1ed9i dung &#8220;g\u1eedi cho t\u00f4i th\u00f4ng tin \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef tr\u00ean trang XYZ&#8221; s\u1ebd \u0111\u01b0\u1ee3c g\u1eedi \u0111\u1ebfn m\u00e1y ch\u1ee7 v\u00e0 m\u00e1y ch\u1ee7 s\u1ebd ph\u1ea3n h\u1ed3i b\u1eb1ng d\u1eef li\u1ec7u. N\u1ebfu m\u00e1y ch\u1ee7 kh\u00f4ng ph\u1ea3n h\u1ed3i v\u1edbi y\u00eau c\u1ea7u tr\u00ean, ng\u01b0\u1eddi d\u00f9ng s\u1ebd th\u1ea5y l\u1ed7i 502 Bad Gateway.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Mot_vai_nguyen_nhan_pho_bien_dan_den_502_Bad_Gateway\"><\/span><b> M\u1ed9t v\u00e0i nguy\u00ean nh\u00e2n ph\u1ed5 bi\u1ebfn d\u1eabn \u0111\u1ebfn 502 Bad Gateway<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Bad Gateway 502 l\u00e0 m\u1ed9t l\u1ed7i chung ch\u1ec9 v\u1ec1 vi\u1ec7c m\u00e1y ch\u1ee7 kh\u00f4ng ph\u1ea3n h\u1ed3i v\u1edbi y\u00eau c\u1ea7u.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Th\u00f4ng th\u01b0\u1eddng, m\u00e3 tr\u1ea1ng th\u00e1i HTTP n\u00e0y kh\u00f4ng ch\u1ec9 ra l\u00fd do c\u1ee5 th\u1ec3 v\u00ec sao m\u00e0 m\u00e1y ch\u1ee7 kh\u00f4ng ph\u1ea3n h\u1ed3i. C\u00f3 nhi\u1ec1u nguy\u00ean nh\u00e2n c\u00f3 th\u1ec3 g\u00e2y ra l\u1ed7i n\u00e0y, trong s\u1ed1 \u0111\u00f3 c\u00f3 th\u1ec3 k\u1ec3 \u0111\u1ebfn c\u00e1c l\u1ed7i sau:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>M\u00e1y ch\u1ee7 qu\u00e1 t\u1ea3i:<\/b><span style=\"font-weight: 400;\"> M\u00e1y ch\u1ee7 web b\u1ecb qu\u00e1 t\u1ea3i theo nhi\u1ec1u c\u00e1ch kh\u00e1c nhau. V\u00ed d\u1ee5: m\u1ed9t trang web c\u00f3 th\u1ec3 c\u00f3 nhi\u1ec1u kh\u00e1ch truy c\u1eadp b\u1ea5t th\u01b0\u1eddng ho\u1eb7c b\u1ecb t\u1ea5n c\u00f4ng DDoS. Sau \u0111\u00f3, b\u1ea1n, v\u1edbi t\u01b0 c\u00e1ch l\u00e0 m\u1ed9t kh\u00e1ch truy c\u1eadp kh\u00e1c, kh\u00f4ng th\u1ec3 truy c\u1eadp v\u00e0o m\u00e1y ch\u1ee7 v\u00e0 nh\u1eadn \u0111\u01b0\u1ee3c th\u00f4ng b\u00e1o Bad Gateway 502.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>S\u1ef1 c\u1ed1 backend:<\/b><span style=\"font-weight: 400;\"> \u0110\u00f4i khi, s\u1ef1 c\u1ed1 ph\u1ee9c t\u1ea1p h\u01a1n v\u00e0 li\u00ean quan \u0111\u1ebfn c\u00e1c y\u1ebfu t\u1ed1 backend c\u1ee7a trang web. Trong tr\u01b0\u1eddng h\u1ee3p n\u00e0y, ch\u1ec9 l\u1eadp tr\u00ecnh vi\u00ean m\u1edbi c\u00f3 th\u1ec3 ph\u00e1t hi\u1ec7n ra l\u1ed7i v\u00e0 s\u1eeda l\u1ed7i 502.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>V\u1ea5n \u0111\u1ec1 m\u1ea1ng:<\/b><span style=\"font-weight: 400;\"> \u0110\u00e2y l\u00e0 m\u1ed9t nguy\u00ean nh\u00e2n \u0111\u01a1n gi\u1ea3n \u2013 s\u1ef1 c\u1ed1 k\u1ebft n\u1ed1i c\u00f3 th\u1ec3 ng\u0103n c\u00e1c m\u00e1y ch\u1ee7 li\u00ean l\u1ea1c v\u1edbi nhau. C\u00f3 th\u1ec3 l\u00e0 d\u00e2y c\u00e1p m\u1ea1ng c\u1ee7a b\u1ea1n b\u1ecb l\u1ecfng ho\u1eb7c l\u1ed7i \u0111\u01b0\u1eddng truy\u1ec1n m\u1ea1ng trong gi\u00e2y l\u00e1t.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Ph\u1ea7n m\u1ec1m b\u1ea3o m\u1eadt:<\/b><span style=\"font-weight: 400;\"> M\u1ed9t s\u1ed1 v\u1ea5n \u0111\u1ec1 v\u1ec1 m\u1ea1ng c\u00f3 th\u1ec3 li\u00ean quan \u0111\u1ebfn ph\u1ea7n m\u1ec1m b\u1ea3o m\u1eadt. T\u01b0\u1eddng l\u1eeda tr\u00ean gateway server ho\u1eb7c h\u1ec7 th\u1ed1ng ph\u00e1t hi\u1ec7n\/ng\u0103n ch\u1eb7n x\u00e2m nh\u1eadp (IDS\/IPS) c\u00f3 th\u1ec3 nghi ng\u1edd ho\u1ea1t \u0111\u1ed9ng \u0111\u1ed9c h\u1ea1i v\u00e0 c\u1ea3n tr\u1edf ho\u1ea1t \u0111\u1ed9ng li\u00ean l\u1ea1c.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>L\u1ed7i c\u1ea5u h\u00ecnh:<\/b><span style=\"font-weight: 400;\"> N\u1ebfu m\u1ed9t trong hai m\u00e1y ch\u1ee7 g\u1eb7p b\u1ea5t k\u1ef3 s\u1ef1 c\u1ed1 c\u1ea5u h\u00ecnh n\u00e0o, ch\u00fang s\u1ebd kh\u00f4ng k\u1ebft n\u1ed1i \u0111\u01b0\u1ee3c, g\u00e2y ra l\u1ed7i Bad Gateway 502.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>V\u1ea5n \u0111\u1ec1 v\u1ec1 DNS:<\/b><span style=\"font-weight: 400;\"> C\u1ea5u h\u00ecnh sai \u0111\u00f4i khi x\u1ea3y ra trong c\u00e1c m\u00e1y ch\u1ee7 h\u1ec7 th\u1ed1ng t\u00ean mi\u1ec1n (DNS). Gateway server kh\u00f4ng th\u1ec3 gi\u1ea3i quy\u1ebft \u0111\u1ecba ch\u1ec9 IP c\u1ee7a m\u00e1y ch\u1ee7 ph\u1ee5 tr\u1ee3 v\u00e0 tr\u00ecnh duy\u1ec7t c\u1ee7a b\u1ea1n hi\u1ec3n th\u1ecb cho b\u1ea1n l\u1ed7i Bad Gateway 502.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Tr\u1ee5c tr\u1eb7c t\u1ea1m th\u1eddi:<\/b><span style=\"font-weight: 400;\"> Th\u00f4ng th\u01b0\u1eddng, l\u1ed7i 502 x\u1ea3y ra do tr\u1ee5c tr\u1eb7c t\u1ea1m th\u1eddi ho\u1eb7c tr\u1ee5c tr\u1eb7c m\u00e1y ch\u1ee7 t\u1ef1 gi\u1ea3i quy\u1ebft m\u00e0 kh\u00f4ng c\u1ea7n can thi\u1ec7p.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">T\u00f9y v\u00e0o nguy\u00ean nh\u00e2n g\u00e2y ra l\u1ed7i 502 Bad Gateway m\u00e0 s\u1ebd c\u00f3 nh\u1eefng c\u00e1ch kh\u1eafc ph\u1ee5c t\u01b0\u01a1ng \u1ee9ng, tuy nhi\u00ean, l\u1ed7i 502 Bad Gateway s\u1ebd g\u00e2y ra m\u1ed9t s\u1ed1 t\u00e1c h\u1ea1i v\u00e0 ch\u1eafc ch\u1eafn s\u1ebd \u1ea3nh h\u01b0\u1edfng tr\u1ef1c ti\u1ebfp \u0111\u1ebfn tr\u1ea3i nghi\u1ec7m c\u1ee7a ng\u01b0\u1eddi d\u00f9ng khi truy c\u1eadp web.<\/span><b><\/b><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Tac_hai_cua_loi_502_Bad_Gateway\"><\/span><b>T\u00e1c h\u1ea1i c\u1ee7a l\u1ed7i 502 Bad Gateway<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">L\u1ed7i 502 Bad Gateway c\u00f3 th\u1ec3 g\u00e2y ra nhi\u1ec1u t\u00e1c h\u1ea1i \u0111\u1ed1i v\u1edbi trang web, th\u1eadm ch\u00ed l\u00e0 th\u01b0\u01a1ng hi\u1ec7u c\u1ee7a b\u1ea1n t\u00f9y v\u00e0o m\u1ee9c \u0111\u1ed9 nghi\u00eam tr\u1ecdng c\u1ee7a l\u1ed7i.<\/span><\/p>\n<h3><b>Gi\u00e1n \u0111o\u1ea1n d\u1ecbch v\u1ee5<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">G\u1eb7p l\u1ed7i &#8220;502 Bad Gateway&#8221; t\u01b0\u01a1ng \u0111\u01b0\u01a1ng v\u1edbi vi\u1ec7c c\u00e1c d\u1ecbch v\u1ee5 s\u1ebd b\u1ecb t\u1eaft t\u1ea1m th\u1eddi. Ch\u00ednh v\u00ec v\u1eady m\u00e0 l\u1ed7i 502 kh\u00f4ng ch\u1ec9 \u0111\u01a1n thu\u1ea7n l\u00e0 m\u1ed9t tr\u1ee5c tr\u1eb7c m\u00e0 c\u00f2n d\u1eabn \u0111\u1ebfn vi\u1ec7c t\u1ea1m d\u1eebng ch\u1ee9c n\u0103ng, khi\u1ebfn ng\u01b0\u1eddi d\u00f9ng t\u00ecm ki\u1ebfm n\u1ec1n t\u1ea3ng thay th\u1ebf ngay l\u00fac \u0111\u00f3.<\/span><\/p>\n<h3><b>T\u00e1c \u0111\u1ed9ng \u0111\u1ebfn kinh doanh<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">\u0110\u1ed1i v\u1edbi c\u00e1c doanh nghi\u1ec7p d\u1ef1a v\u00e0o giao d\u1ecbch tr\u1ef1c tuy\u1ebfn, l\u1ed7i 502 kh\u00f4ng ch\u1ec9 l\u00e0 m\u1ed9t tr\u1ee5c tr\u1eb7c m\u00e0 c\u00f2n l\u00e0 tr\u1edf ng\u1ea1i cho vi\u1ec7c t\u1ea1o doanh thu.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Khi c\u00e1c quy tr\u00ecnh mua h\u00e0ng b\u1ecb gi\u00e1n \u0111o\u1ea1n ho\u1eb7c gi\u1ecf h\u00e0ng b\u1ecb m\u1ea5t do nh\u1eefng l\u1ed7i n\u00e0y, ng\u01b0\u1eddi d\u00f9ng th\u01b0\u1eddng m\u1ea5t \u0111i \u0111\u1ed9ng l\u1ef1c mua h\u00e0ng ho\u1eb7c suy ngh\u0129 l\u1ea1i v\u1ec1 quy\u1ebft \u0111\u1ecbnh mua s\u1eafm \u0111\u00f3, \u0111\u1eb7c bi\u1ec7t \u0111\u1ed1i v\u1edbi c\u00e1c s\u00e0n th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed.<\/span><\/p>\n<h3><b>T\u00e1c \u0111\u1ed9ng \u0111\u1ebfn nh\u1eadn th\u1ee9c v\u1ec1 th\u01b0\u01a1ng hi\u1ec7u<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Vi\u1ec7c t\u00e1i di\u1ec5n l\u1ed7i 502 c\u00f3 th\u1ec3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn \u0111\u1ed9 tin c\u1eady v\u1ec1 c\u00f4ng ngh\u1ec7 c\u1ee7a th\u01b0\u01a1ng hi\u1ec7u. Ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1ec3 c\u1ea3m nh\u1eadn th\u01b0\u01a1ng hi\u1ec7u v\u1edbi th\u00e1i \u0111\u1ed9 ho\u00e0i nghi, \u0111\u1eb7t c\u00e2u h\u1ecfi v\u1ec1 n\u0103ng l\u1ef1c c\u1ee7a th\u01b0\u01a1ng hi\u1ec7u trong l\u0129nh v\u1ef1c k\u1ef9 thu\u1eadt s\u1ed1.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u0110\u1eb7c bi\u1ec7t l\u00e0 \u0111\u1ed1i v\u1edbi nh\u1eefng d\u1ecbch v\u1ee5 quan tr\u1ecdng, v\u00ed d\u1ee5 nh\u01b0 t\u00e0i ch\u00ednh, m\u00e0 ng\u01b0\u1eddi d\u00f9ng b\u1ecb gi\u00e1n \u0111o\u1ea1n khi \u0111ang th\u1ef1c hi\u1ec7n c\u00e1c t\u00e1c v\u1ee5 quan tr\u1ecdng c\u00f2n c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn tr\u1ea3i nghi\u1ec7m ti\u00eau c\u1ef1c, bao g\u1ed3m m\u1ea5t ni\u1ec1m tin v\u00e0o d\u1ecbch v\u1ee5, th\u1ea5t v\u1ecdng v\u1edbi th\u01b0\u01a1ng hi\u1ec7u.<\/span><\/p>\n<h3><b>Nh\u1eefng th\u00e1ch th\u1ee9c ho\u1ea1t \u0111\u1ed9ng<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Vi\u1ec7c gi\u1ea3i quy\u1ebft l\u1ed7i 502 kh\u00f4ng ch\u1ec9 \u0111\u01a1n thu\u1ea7n l\u00e0 s\u1eeda l\u1ed7i nhanh ch\u00f3ng; m\u00e0 c\u00f2n li\u00ean quan \u0111\u1ebfn vi\u1ec7c \u0111i\u1ec1u h\u01b0\u1edbng qua m\u1ed9t th\u1eed th\u00e1ch v\u1ec1 m\u1eb7t k\u1ef9 thu\u1eadt, \u0111\u00f2i h\u1ecfi th\u1eddi gian v\u00e0 chuy\u00ean m\u00f4n.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Nh\u1eefng th\u00e1ch th\u1ee9c v\u1eadn h\u00e0nh n\u00e0y th\u01b0\u1eddng \u0111\u01b0\u1ee3c gi\u1ea3i quy\u1ebft v\u1edbi m\u1ee9c chi ph\u00ed h\u1ed7 tr\u1ee3 cao \u0111i k\u00e8m v\u1edbi n\u1ed7 l\u1ef1c c\u1ee7a c\u1ea3 \u0111\u1ed9i ng\u0169 nh\u1eb1m duy tr\u00ec ho\u1ea1t \u0111\u1ed9ng k\u1ef9 thu\u1eadt s\u1ed1 li\u1ec1n m\u1ea1ch.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Lap_trinh_vien_co_the_lam_gi_de_khac_phuc_loi_502_Bad_Gateway\"><\/span><b>L\u1eadp tr\u00ecnh vi\u00ean c\u00f3 th\u1ec3 l\u00e0m g\u00ec \u0111\u1ec3 kh\u1eafc ph\u1ee5c l\u1ed7i 502 Bad Gateway?<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Tuy kh\u00f4ng ph\u1ea3i l\u00fac n\u00e0o b\u1ea1n c\u0169ng c\u00f3 th\u1ec3 s\u1eeda \u0111\u01b0\u1ee3c l\u1ed7i 502 v\u00ec l\u1ed7i n\u00e0y c\u00f2n c\u00f3 th\u1ec3 x\u1ea3y ra do b\u00ean th\u1ee9 ba ho\u1eb7c ph\u00eda ng\u01b0\u1eddi d\u00f9ng, nh\u01b0ng n\u1ebfu trang web c\u1ee7a b\u1ea1n g\u1eb7p l\u1ed7i 502 Bad Gateway, b\u1ea1n n\u00ean kh\u1eafc ph\u1ee5c c\u00e0ng s\u1edbm c\u00e0ng t\u1ed1t \u0111\u1ec3 tr\u00e1nh l\u00e0m ng\u01b0\u1eddi d\u00f9ng th\u1ea5t v\u1ecdng v\u00e0 \u1ea3nh h\u01b0\u1edfng ti\u00eau c\u1ef1c \u0111\u1ebfn ng\u01b0\u1eddi d\u00f9ng.<\/span><\/p>\n<h3><b>Ki\u1ec3m tra m\u00e1y ch\u1ee7<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Trong h\u1ea7u h\u1ebft c\u00e1c tr\u01b0\u1eddng h\u1ee3p, l\u1ed7i 502 c\u00f3 th\u1ec3 l\u00e0 do d\u1ecbch v\u1ee5 l\u01b0u tr\u1eef m\u00e0 trang web c\u1ee7a b\u1ea1n d\u1ef1a tr\u00ean. C\u00f3 nh\u1eefng tr\u01b0\u1eddng h\u1ee3p ph\u1ea3i t\u1ea3i t\u1eadp l\u1ec7nh \u0111\u1ec3 truy c\u1eadp m\u1ed9t trang web nh\u01b0ng qu\u00e1 tr\u00ecnh n\u00e0y m\u1ea5t qu\u00e1 nhi\u1ec1u th\u1eddi gian.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">M\u1ed9t s\u1ed1 d\u1ecbch v\u1ee5 l\u01b0u tr\u1eef s\u1eed d\u1ee5ng m\u1ed9t h\u1ec7 th\u1ed1ng c\u00f3 t\u00ean l\u00e0 kill script \u0111\u1ec3 d\u1eebng nh\u1eefng y\u00eau c\u1ea7u m\u1ea5t nhi\u1ec1u th\u1eddi gian h\u01a1n m\u1ee9c c\u1ea7n thi\u1ebft n\u00e0y. Lo\u1ea1i t\u1eadp l\u1ec7nh n\u00e0y, \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong m\u1ed9t s\u1ed1 tr\u01b0\u1eddng h\u1ee3p b\u1edfi d\u1ecbch v\u1ee5 l\u01b0u tr\u1eef chia s\u1ebb, c\u00f3 th\u1ec3 t\u1ea1o ra l\u1ed7i v\u00e0 ng\u0103n ch\u1eb7n quy\u1ec1n truy c\u1eadp v\u00e0o c\u00e1c trang web ho\u1eb7c t\u00e0i nguy\u00ean \u0111\u01b0\u1ee3c chia s\u1ebb.<\/span><\/p>\n<h3><b>Ki\u1ec3m tra nh\u1eadt k\u00fd l\u1ed7i (error logs)<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">L\u1ed7i 502 c\u0169ng c\u00f3 th\u1ec3 l\u00e0 do l\u1ed7i n\u1ed9i b\u1ed9 tr\u00ean trang web c\u1ee7a b\u1ea1n. \u0110i\u1ec1u \u0111\u1ea7u ti\u00ean b\u1ea1n c\u00f3 th\u1ec3 l\u00e0m \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o kh\u00f4ng c\u00f3 v\u1ea5n \u0111\u1ec1 n\u00e0o nh\u01b0 v\u1eady l\u00e0 ki\u1ec3m tra nh\u1eadt k\u00fd l\u1ed7i.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">N\u1ebfu \u0111ang s\u1eed d\u1ee5ng WordPress, b\u1ea1n c\u00f3 th\u1ec3 b\u1eadt nh\u1eadt k\u00fd l\u1ed7i v\u00e0 theo d\u00f5i nh\u1eefng g\u00ec \u0111ang x\u1ea3y ra tr\u00ean trang web.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u0110\u1ec3 th\u1ef1c hi\u1ec7n vi\u1ec7c n\u00e0y, b\u1ea1n c\u1ea7n ch\u1ec9nh s\u1eeda t\u1ec7p c\u1ea5u h\u00ecnh wp-config.php b\u1eb1ng c\u00e1ch th\u00eam \u0111o\u1ea1n code sau:<\/span><\/p>\n<pre><span style=\"font-weight: 400;\">define( 'WP_DEBUG', true );<\/span>\r\n\r\n<span style=\"font-weight: 400;\">define( 'WP_DEBUG_LOG', true );<\/span>\r\n\r\n<span style=\"font-weight: 400;\">define( 'WP_DEBUG_DISPLAY', false );<\/span><\/pre>\n<h3><b>Ki\u1ec3m tra l\u1eadp tr\u00ecnh PHP<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">M\u1ed9t vi\u1ec7c kh\u00e1c c\u1ea7n l\u00e0m l\u00e0 ki\u1ec3m tra l\u1ed7i l\u1eadp tr\u00ecnh PHP tr\u00ean trang web c\u1ee7a b\u1ea1n.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">B\u1ea1n c\u00f3 th\u1ec3 ki\u1ec3m tra \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o kh\u00f4ng c\u00f3 v\u1ea5n \u0111\u1ec1 v\u1ec1 th\u1eddi gian ch\u1edd n\u00e0o d\u1eabn \u0111\u1ebfn ch\u1ea5m d\u1ee9t m\u1ed9t s\u1ed1 quy tr\u00ecnh, theo c\u00e1ch \u0111\u00e3 l\u00ean l\u1ecbch, sau m\u1ed9t kho\u1ea3ng th\u1eddi gian nh\u1ea5t \u0111\u1ecbnh. \u0110\u1ec3 l\u00e0m \u0111i\u1ec1u n\u00e0y, b\u1ea1n c\u1ea7n ki\u1ec3m tra c\u1ea5u h\u00ecnh PHP c\u1ee7a m\u00ecnh v\u00e0 x\u00e1c \u0111\u1ecbnh xem b\u1ea1n c\u00f3 n\u00ean \u0111\u1eb7t th\u1eddi gian ch\u1edd l\u00e2u h\u01a1n hay kh\u00f4ng.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Ngo\u00e0i ra, n\u1ebfu d\u1ecbch v\u1ee5 l\u01b0u tr\u1eef c\u1ee7a b\u1ea1n cho ph\u00e9p b\u1ea1n l\u00e0m nh\u01b0 v\u1eady, b\u1ea1n c\u00f3 th\u1ec3 kh\u1edfi \u0111\u1ed9ng l\u1ea1i PHP ho\u1eb7c y\u00eau c\u1ea7u m\u00e1y ch\u1ee7 l\u00e0m nh\u01b0 v\u1eady v\u00e0 xem li\u1ec7u s\u1ef1 c\u1ed1 c\u00f3 \u0111\u01b0\u1ee3c gi\u1ea3i quy\u1ebft b\u1eb1ng c\u00e1ch kh\u1edfi \u0111\u1ed9ng l\u1ea1i hay kh\u00f4ng.<\/span><\/p>\n<blockquote><p><em>Tham kh\u1ea3o th\u00eam: <a href=\"https:\/\/itviec.com\/blog\/11-sach-hoc-lap-trinh-php\/\" target=\"_blank\" rel=\"noopener\"><strong>PHP l\u00e0 g\u00ec? 11 S\u00e1ch l\u1eadp tr\u00ecnh PHP hay nh\u1ea5t m\u1ecdi c\u1ea5p \u0111\u1ed9<\/strong><\/a><\/em><\/p><\/blockquote>\n<h3><b>Ki\u1ec3m so\u00e1t CDN<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">M\u1ed9t gi\u1ea3i ph\u00e1p kh\u1ea3 thi kh\u00e1c c\u00f3 th\u1ec3 l\u00e0 t\u1ea1m th\u1eddi v\u00f4 hi\u1ec7u h\u00f3a CDN, t\u1ee9c l\u00e0 M\u1ea1ng ph\u00e2n ph\u1ed1i n\u1ed9i dung (Content Delivery Network). Tr\u00ean th\u1ef1c t\u1ebf, l\u1ed7i 502 c\u00f3 th\u1ec3 x\u1ea3y ra do s\u1eed d\u1ee5ng c\u00e1c d\u1ecbch v\u1ee5 b\u1ea3o v\u1ec7 DDoS v\u00e0 t\u01b0\u1eddng l\u1eeda c\u00f3 trong m\u1ea1ng CDN c\u1ee7a b\u00ean th\u1ee9 ba, ch\u1eb3ng h\u1ea1n nh\u01b0 c\u00e1c m\u1ea1ng \u0111\u01b0\u1ee3c <a href=\"https:\/\/www.godaddy.com\/en-sg\/offers\/godaddy\" target=\"_blank\" rel=\"noopener\">GoDaddy<\/a> v\u00e0 <a href=\"https:\/\/www.cloudflare.com\/lp\/ppc\/overview-x\/\" target=\"_blank\" rel=\"noopener\">CloudFlare<\/a> s\u1eed d\u1ee5ng.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">N\u1ebfu l\u1ed7i thu\u1ed9c b\u00ean th\u1ee9 ba, b\u1ea1n c\u00f3 th\u1ec3 li\u00ean h\u1ec7 v\u1edbi d\u1ecbch v\u1ee5 ch\u0103m s\u00f3c kh\u00e1ch h\u00e0ng \u0111\u1ec3 \u0111\u01b0\u1ee3c ki\u1ec3m tra v\u00e0 kh\u1eafc ph\u1ee5c s\u1ef1 c\u1ed1.<\/span><\/p>\n<h3><b>Ki\u1ec3m tra plugin v\u00e0 theme trong WordPress<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Trong m\u1ed9t s\u1ed1 tr\u01b0\u1eddng h\u1ee3p, vi\u1ec7c s\u1eed d\u1ee5ng plugin ho\u1eb7c theme c\u00f3 c\u1ea5u h\u00ecnh sai c\u00f3 th\u1ec3 g\u00e2y ra l\u1ed7i 502.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u0110\u1ec3 gi\u1ea3i quy\u1ebft l\u1ed7i 502 Bad Gateway trong WordPress, tr\u01b0\u1edbc ti\u00ean b\u1ea1n c\u00f3 th\u1ec3 th\u1eed t\u1eaft l\u1ea7n l\u01b0\u1ee3t c\u00e1c plugin b\u1ea1n s\u1eed d\u1ee5ng, kh\u00f4ng khuy\u1ebfn kh\u00edch t\u1eaft t\u1ea5t c\u1ea3 c\u00e1c plugin c\u00f9ng m\u1ed9t l\u00fac, \u0111\u1ec3 ki\u1ec3m tra xem ch\u00fang c\u00f3 ph\u1ea3i l\u00e0 nguy\u00ean nh\u00e2n g\u00e2y ra s\u1ef1 c\u1ed1 hay kh\u00f4ng.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Ho\u1eb7c, b\u1ea1n c\u00f3 th\u1ec3 t\u1eaft t\u1ea5t c\u1ea3 plugin v\u00e0 k\u00edch ho\u1ea1t l\u1ea1i t\u1eebng plugin m\u1ed9t \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh plugin n\u00e0o g\u00e2y ra l\u1ed7i.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">N\u00f3i chung, b\u1ea1n n\u00ean ch\u1ecdn m\u1ed9t CMS \u00edt ph\u1ee5 thu\u1ed9c v\u00e0o plugin h\u01a1n v\u1ec1 ch\u1ee9c n\u0103ng \u0111\u1ec3 kh\u00f4ng ph\u1ea3i g\u1eb7p m\u00e2u thu\u1eabn gi\u1eefa c\u00e1c plugin v\u1edbi nhau.<\/span><\/p>\n<blockquote><p><em>Tham kh\u1ea3o th\u00eam: <a href=\"https:\/\/itviec.com\/blog\/cms-la-gi\/\" target=\"_blank\" rel=\"noopener\"><strong>CMS l\u00e0 g\u00ec? Top 10 CMS ph\u1ed5 bi\u1ebfn nh\u1ea5t<\/strong><\/a><\/em><\/p><\/blockquote>\n<p><span style=\"font-weight: 400;\">Ngo\u00e0i ra, b\u1ea1n c\u0169ng c\u00f3 th\u1ec3 t\u1ea1m th\u1eddi v\u00f4 hi\u1ec7u h\u00f3a t\u01b0\u1eddng l\u1eeda ho\u1eb7c plugin trong CMS c\u1ee7a m\u00ecnh \u0111\u1ec3 xem c\u00f3 v\u1ea5n \u0111\u1ec1 g\u00ec kh\u00f4ng.<\/span><b><\/b><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Nhung_viec_lap_trinh_vien_co_the_lam_ngay_tu_dau_de_tranh_502_Bad_Gateway\"><\/span><b>Nh\u1eefng vi\u1ec7c l\u1eadp tr\u00ecnh vi\u00ean c\u00f3 th\u1ec3 l\u00e0m ngay t\u1eeb \u0111\u1ea7u \u0111\u1ec3 tr\u00e1nh 502 Bad Gateway<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><b> Ch\u1ecdn d\u1ecbch v\u1ee5 hosting v\u00e0 h\u1ed7 tr\u1ee3 \u0111\u00e1ng tin c\u1eady \u0111\u1ec3 tr\u00e1nh l\u1ed7i ngay t\u1eeb \u0111\u1ea7u<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Ng\u0103n ch\u1eb7n l\u1ed7i 502 v\u00e0 c\u00e1c s\u1ef1 c\u1ed1 HTTP kh\u00e1c tr\u00ean trang web c\u1ee7a b\u1ea1n b\u1eb1ng c\u00e1ch \u0111\u1ea3m b\u1ea3o trang web \u0111\u01b0\u1ee3c thi\u1ebft l\u1eadp an to\u00e0n ngay t\u1eeb \u0111\u1ea7u. Ch\u1ecdn m\u1ed9t CMS v\u00e0 d\u1ecbch v\u1ee5 l\u01b0u tr\u1eef web \u0111\u00e1ng tin c\u1eady, \u0111\u1ed3ng th\u1eddi c\u00e1c bi\u1ec7n ph\u00e1p b\u1ea3o m\u1eadt, k\u1ef9 thu\u1eadt SEO v\u00e0 \u0111i\u1ec1u h\u01b0\u1edbng m\u00e0 b\u1ea1n thi\u1ebft l\u1eadp \u0111\u1ec1u s\u1ebd gi\u00fap b\u1ea1n tr\u00e1nh t\u00e1c \u0111\u1ed9ng ti\u00eau c\u1ef1c \u0111\u1ebfn tr\u1ea3i nghi\u1ec7m c\u1ee7a ng\u01b0\u1eddi d\u00f9ng khi g\u1eb7p l\u1ed7i.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Ch\u1ecdn nh\u00e0 cung c\u1ea5p web hosting c\u1ee7a b\u1ea1n m\u1ed9t c\u00e1ch c\u1ea9n th\u1eadn. D\u1ecbch v\u1ee5 hosting s\u1ebd \u0111\u00f3ng vai tr\u00f2 l\u1edbn nh\u1ea5t trong vi\u1ec7c trang web c\u1ee7a b\u1ea1n nhanh nh\u01b0 th\u1ebf n\u00e0o v\u00e0 \u0111\u00e1ng tin c\u1eady nh\u01b0 th\u1ebf n\u00e0o. \u0110\u1ecdc c\u00e1c b\u00e0i \u0111\u00e1nh gi\u00e1 v\u00e0 t\u00ecm ki\u1ebfm c\u00e1c d\u1ecbch v\u1ee5 l\u01b0u tr\u1eef ph\u00f9 h\u1ee3p v\u1edbi l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp v\u00e0 s\u1ed1 l\u01b0\u1ee3ng n\u1ed9i dung tr\u00ean trang web c\u1ee7a b\u1ea1n. B\u1ea1n mu\u1ed1n xem x\u00e9t t\u1ed1c \u0111\u1ed9, \u0111\u1ed9 tin c\u1eady, kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng, b\u1ea3o m\u1eadt v\u00e0 h\u1ed7 tr\u1ee3 kh\u00e1ch h\u00e0ng. V\u1edbi d\u1ecbch v\u1ee5 l\u01b0u tr\u1eef ch\u1ea5t l\u01b0\u1ee3ng cao, kh\u00e1ch truy c\u1eadp s\u1ebd c\u00f3 th\u1ec3 truy c\u1eadp trang web c\u1ee7a b\u1ea1n m\u1ed9t c\u00e1ch \u0111\u00e1ng tin c\u1eady b\u1ea5t c\u1ee9 khi n\u00e0o h\u1ecd mu\u1ed1n.<\/span><\/p>\n<h3><b>\u0110\u1ea3m b\u1ea3o ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1ec3 li\u00ean h\u1ec7 v\u1edbi b\u1ea1n<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Kh\u00e1ch truy c\u1eadp c\u1ee7a b\u1ea1n c\u00f3 th\u1ec3 l\u00e0 ng\u01b0\u1eddi \u0111\u1ea7u ti\u00ean nh\u1eadn th\u1ea5y r\u1eb1ng trang web c\u1ee7a b\u1ea1n kh\u00f4ng ho\u1ea1t \u0111\u1ed9ng ho\u1eb7c hi\u1ec3n th\u1ecb l\u1ed7i Bad Gateway 502. H\u1ecd c\u00f3 th\u1ec3 th\u00f4ng b\u00e1o v\u1edbi b\u1ea1n \u0111\u1ec3 b\u1ea1n c\u00f3 th\u1ec3 nhanh ch\u00f3ng gi\u1ea3i quy\u1ebft v\u1ea5n \u0111\u1ec1.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Ch\u00ednh v\u00ec th\u1ebf, h\u00e3y \u0111\u1ea3m b\u1ea3o r\u1eb1ng h\u1ecd c\u00f3 c\u00e1ch li\u00ean h\u1ec7 d\u1ec5 d\u00e0ng v\u1edbi b\u1ea1n ngo\u00e0i trang web c\u1ee7a b\u1ea1n, v\u00ed d\u1ee5 nh\u01b0 m\u1ea1ng x\u00e3 h\u1ed9i, \u0111\u1ecba ch\u1ec9 email c\u00f4ng khai ho\u1eb7c H\u1ed3 s\u01a1 doanh nghi\u1ec7p tr\u00ean Google.<\/span><\/p>\n<h3><b>T\u00f9y ch\u1ec9nh trang th\u00f4ng b\u00e1o l\u1ed7i 502 Bad Gateway<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">M\u1eb7c d\u00f9 nh\u1eefng trang th\u00f4ng b\u00e1o l\u1ed7i n\u00e0y kh\u00f4ng gi\u1ea3i quy\u1ebft \u0111\u01b0\u1ee3c v\u1ea5n \u0111\u1ec1 l\u1ed7i nh\u01b0ng ng\u01b0\u1eddi d\u00f9ng s\u1ebd c\u00f3 c\u1ea3m gi\u00e1c nh\u01b0 h\u1ecd v\u1eabn \u0111ang truy c\u1eadp trang web c\u1ee7a b\u1ea1n v\u00e0 ch\u1ec9 \u0111\u01a1n gi\u1ea3n l\u00e0 trang web \u0111\u00f3 hi\u1ec7n kh\u00f4ng truy c\u1eadp \u0111\u01b0\u1ee3c thay v\u00ec ch\u1ec9 nh\u1eadn \u0111\u01b0\u1ee3c m\u1ed9t trang tr\u1ed1ng.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Trang t\u00f9y ch\u1ec9nh c\u00f3 th\u1ec3 l\u00e0m cho trang web c\u1ee7a b\u1ea1n tr\u00f4ng chuy\u00ean nghi\u1ec7p h\u01a1n v\u00e0 gi\u00fap \u0111\u1ea3m b\u1ea3o kh\u00e1ch truy c\u1eadp quay l\u1ea1i v\u00e0 th\u1eed l\u1ea1i. Sau \u0111\u00e2y l\u00e0 v\u00ed d\u1ee5:<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-58585 aligncenter\" src=\"https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/01\/502-bad-gateway-google-vippro.png\" alt=\"502 bad gateway error - google\" width=\"1356\" height=\"596\" srcset=\"https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/01\/502-bad-gateway-google-vippro.png 1356w, https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/01\/502-bad-gateway-google-vippro-300x132.png 300w, https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/01\/502-bad-gateway-google-vippro-640x281.png 640w, https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/01\/502-bad-gateway-google-vippro-200x88.png 200w, https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/01\/502-bad-gateway-google-vippro-768x338.png 768w, https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/01\/502-bad-gateway-google-vippro-100x44.png 100w, https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/01\/502-bad-gateway-google-vippro-700x308.png 700w\" sizes=\"auto, (max-width: 1356px) 100vw, 1356px\" \/><\/p>\n<p style=\"text-align: center;\"><em>Trang th\u00f4ng b\u00e1o l\u1ed7i 502 Bad Gateway c\u1ee7a Google v\u1edbi thi\u1ebft k\u1ebf \u0111\u1eadm &#8220;d\u1ea5u \u1ea5n&#8221; th\u01b0\u01a1ng hi\u1ec7u.<\/em><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-58586 size-full\" src=\"https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/01\/502-bad-gateway-gitlab-vippro-e1704876675167.png\" alt=\"502 bad gateway error - gitlab\" width=\"1626\" height=\"1252\" srcset=\"https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/01\/502-bad-gateway-gitlab-vippro-e1704876675167.png 1626w, https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/01\/502-bad-gateway-gitlab-vippro-e1704876675167-300x231.png 300w, https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/01\/502-bad-gateway-gitlab-vippro-e1704876675167-640x493.png 640w, https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/01\/502-bad-gateway-gitlab-vippro-e1704876675167-200x154.png 200w, https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/01\/502-bad-gateway-gitlab-vippro-e1704876675167-768x591.png 768w, https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/01\/502-bad-gateway-gitlab-vippro-e1704876675167-1536x1183.png 1536w, https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/01\/502-bad-gateway-gitlab-vippro-e1704876675167-100x77.png 100w, https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/01\/502-bad-gateway-gitlab-vippro-e1704876675167-584x450.png 584w, https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/01\/502-bad-gateway-gitlab-vippro-e1704876675167-1558x1200.png 1558w\" sizes=\"auto, (max-width: 1626px) 100vw, 1626px\" \/><\/p>\n<p style=\"text-align: center;\"><em>Trang th\u00f4ng b\u00e1o l\u1ed7i 502 Bad Gateway c\u1ee7a GitLab v\u00e0 th\u00f4ng \u0111i\u1ec7p r\u00f5 r\u00e0ng k\u1ebft h\u1ee3p v\u1edbi \u0111\u01b0\u1eddng d\u1eabn \u0111i\u1ec1u h\u01b0\u1edbng.<\/em><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Nhung_cau_hoi_502_Bad_Gateway_thuong_gap\"><\/span><b>Nh\u1eefng c\u00e2u h\u1ecfi 502 Bad Gateway th\u01b0\u1eddng g\u1eb7p<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><strong>502 Bad Gateway c\u00f3 ph\u1ea3i l\u00e0 hack kh\u00f4ng?<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">L\u1ed7i 502 Bad Gateway th\u01b0\u1eddng kh\u00f4ng ph\u1ea3i l\u00e0 d\u1ea5u hi\u1ec7u c\u1ee7a hacking. N\u00f3i chung, \u0111\u00e2y l\u00e0 s\u1ef1 c\u1ed1 ph\u00eda m\u00e1y ch\u1ee7, cho th\u1ea5y r\u1eb1ng m\u1ed9t m\u00e1y ch\u1ee7 tr\u00ean internet \u0111\u00e3 nh\u1eadn \u0111\u01b0\u1ee3c ph\u1ea3n h\u1ed3i kh\u00f4ng h\u1ee3p l\u1ec7 t\u1eeb m\u1ed9t m\u00e1y ch\u1ee7 kh\u00e1c.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u0110i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 l\u00e0 do qu\u00e1 t\u1ea3i th\u1ef1c s\u1ef1 c\u1ee7a ng\u01b0\u1eddi d\u00f9ng ho\u1eb7c do m\u1ed9t cu\u1ed9c t\u1ea5n c\u00f4ng DDoS do tin t\u1eb7c c\u1ed1 g\u1eafng &#8220;DDoSing&#8221; m\u00e1y ch\u1ee7.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">L\u01b0u \u00fd: C\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng DDOS th\u01b0\u1eddng g\u00e2y ra l\u1ed7i 502, nh\u01b0ng kh\u00f4ng ph\u1ea3i t\u1ea5t c\u1ea3 c\u00e1c l\u1ed7i 502 Bad Gateway \u0111\u1ec1u do DDOS g\u00e2y ra.<\/span><\/p>\n<h3><b>L\u1ed7i Bad Gateway c\u00f3 nghi\u00eam tr\u1ecdng kh\u00f4ng?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Kh\u00f4ng. L\u1ed7i n\u00e0y s\u1ebd kh\u00f4ng tr\u1ef1c ti\u1ebfp \u201cti\u00eau di\u1ec7t\u201d h\u1ec7 th\u1ed1ng ho\u1eb7c trang web c\u1ee7a b\u1ea1n.<\/span><\/p>\n<h3><b>L\u1ed7i Bad Gateway c\u00f3 th\u1ec3 t\u1ef1 kh\u1eafc ph\u1ee5c \u0111\u01b0\u1ee3c kh\u00f4ng?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">\u0110\u00f4i khi h\u1ec7 th\u1ed1ng c\u00f3 th\u1ec3 t\u1ef1 kh\u1eafc ph\u1ee5c s\u1ef1 c\u1ed1 502. Tuy nhi\u00ean, n\u1ebfu l\u1ed7i 502 x\u1ea3y ra th\u01b0\u1eddng xuy\u00ean, \u0111\u1ed9i ng\u0169 l\u1eadp tr\u00ecnh vi\u00ean n\u00ean t\u00ecm hi\u1ec3u nguy\u00ean nh\u00e2n s\u00e2u xa h\u01a1n \u0111\u1ec3 c\u1ea3i thi\u1ec7n tr\u1ea3i nghi\u1ec7m ng\u01b0\u1eddi d\u00f9ng.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Tong_ket_502_Bad_Gateway_la_gi\"><\/span><b>T\u1ed5ng k\u1ebft 502 Bad Gateway l\u00e0 g\u00ec<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">L\u1ed7i 502 Bad Gateway l\u00e0 m\u1ed9t trong nh\u1eefng l\u1ed7i r\u1ea5t th\u01b0\u1eddng g\u1eb7p khi duy\u1ec7t web. M\u1eb7c d\u00f9 l\u1ed7i n\u00e0y c\u00f3 th\u1ec3 \u0111\u1ebfn t\u1eeb nhi\u1ec1u nguy\u00ean nh\u00e2n kh\u00e1c nhau, tuy nhi\u00ean n\u1ebfu kh\u00f4ng t\u00ecm c\u00e1ch kh\u1eafc ph\u1ee5c ho\u1eb7c ph\u00f2ng tr\u00e1nh, l\u1ed7i 502 c\u00f3 th\u1ec3 g\u00e2y ra nhi\u1ec1u t\u00e1c h\u1ea1i \u0111\u00e1ng k\u1ec3 \u0111\u1ebfn trang web c\u0169ng nh\u01b0 tr\u1ea3i nghi\u1ec7m ng\u01b0\u1eddi d\u00f9ng v\u00e0 th\u01b0\u01a1ng hi\u1ec7u c\u1ee7a b\u1ea1n.<\/span><\/p>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" class=\"sp-no-webp wp-image-5668 aligncenter sp-no-webp entered lazyloaded\" src=\"https:\/\/itviec.com\/blog\/wp-content\/uploads\/2015\/07\/Robby2.png\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" srcset=\"https:\/\/itviec.com\/blog\/wp-content\/uploads\/2015\/07\/Robby2.png 300w, https:\/\/itviec.com\/blog\/wp-content\/uploads\/2015\/07\/Robby2-200x200.png 200w, https:\/\/itviec.com\/blog\/wp-content\/uploads\/2015\/07\/Robby2-60x60.png 60w\" alt=\"robby-2\" width=\"300\" height=\"300\" data-lazy-src=\"https:\/\/itviec.com\/blog\/wp-content\/uploads\/2015\/07\/Robby2.png\" data-lazy-sizes=\"(max-width: 300px) 100vw, 300px\" data-lazy-srcset=\"https:\/\/itviec.com\/blog\/wp-content\/uploads\/2015\/07\/Robby2.png 300w, https:\/\/itviec.com\/blog\/wp-content\/uploads\/2015\/07\/Robby2-200x200.png 200w, https:\/\/itviec.com\/blog\/wp-content\/uploads\/2015\/07\/Robby2-60x60.png 60w\" data-ll-status=\"loaded\" \/><\/figure>\n<\/div>\n<p id=\"block-bdf220a1-3635-4794-9101-81d879939b92\" class=\"has-text-align-center\" style=\"text-align: center;\"><strong>B\u1ea1n th\u1ea5y b\u00e0i vi\u1ebft hay v\u00e0 h\u1eefu \u00edch? \u0110\u1eebng ng\u1ea1i Share v\u1edbi b\u1ea1n b\u00e8 v\u00e0 \u0111\u1ed3ng nghi\u1ec7p nh\u00e9.<\/strong><\/p>\n<p id=\"block-a1315aab-406f-48df-97fc-6b9584e6e134\" class=\"has-text-align-center\" style=\"text-align: center;\"><strong>V\u00e0 nhanh tay tham kh\u1ea3o\u00a0<a href=\"http:\/\/itviec.com\/\" target=\"_blank\" rel=\"noreferrer noopener\">vi\u1ec7c l\u00e0m IT<\/a>\u00a0\u201cch\u1ea5t\u201d tr\u00ean ITviec<\/strong>!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>L\u1ed7i 502 Bad Gateway l\u00e0 m\u1ed9t trong nh\u1eefng l\u1ed7i th\u01b0\u1eddng b\u1eaft g\u1eb7p nh\u1ea5t trong qu\u00e1 tr\u00ecnh duy\u1ec7t web. 502 Bad Gateway khi\u1ebfn vi\u1ec7c truy c\u1eadp trang web b\u1ecb gi\u00e1n \u0111o\u1ea1n v\u00e0 g\u00e2y kh\u00f3 ch\u1ecbu trong tr\u1ea3i nghi\u1ec7m s\u1eed d\u1ee5ng c\u1ee7a ng\u01b0\u1eddi d\u00f9ng, do \u0111\u00f3, c\u00e1c l\u1eadp tr\u00ecnh vi\u00ean c\u1ea7n \u0111\u01b0\u1ee3c trang b\u1ecb ki\u1ebfn th\u1ee9c \u0111\u1ea7y [&hellip;]<\/p>\n","protected":false},"author":95,"featured_media":58597,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_gspb_post_css":"","footnotes":""},"categories":[109],"tags":[],"class_list":["post-58235","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-chuyen-mon-it"],"blocksy_meta":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.8 (Yoast SEO v27.8) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>502 Bad Gateway l\u00e0 g\u00ec? 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Nh\u1eefng c\u00e1ch kh\u1eafc ph\u1ee5c hi\u1ec7u qu\u1ea3","description":"502 Bad Gateway l\u00e0 m\u1ed9t trong nh\u1eefng l\u1ed7i th\u01b0\u1eddng g\u1eb7p nh\u1ea5t khi duy\u1ec7t web. 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