{"id":55407,"date":"2020-01-20T00:00:00","date_gmt":"2020-01-19T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/nginx-kak-pobedit-response_status-0"},"modified":"2020-02-18T14:03:31","modified_gmt":"2020-02-18T11:03:31","slug":"nginx-kak-pobedit-response_status-0","status":"publish","type":"post","link":"https:\/\/prohoster.info\/da\/blog\/administrirovanie\/nginx-kak-pobedit-response_status-0","title":{"rendered":"[Nginx] \u041a\u0430\u043a \u043f\u043e\u0431\u0435\u0434\u0438\u0442\u044c response_status = 0","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Artikel af typen \"noter i margenerne\".<\/p>\n

TL:DR:<\/b><\/p>\n

http2_max_field_size 8k; # redder alle!<\/code><\/pre>\n
P\u00e5 et af projekterne, efter \u00e6ndring af noget intern backend-logik, begyndte jeg at observere en m\u00e6rkelig response_code i loggene, nemlig \u2014 0. I loggene ser det cirka s\u00e5dan her ud:<\/p>\n
{\n  \"timestamp\": \"2020-01-17T08:41:51+00:00\",\n  \"remote_addr\": \"zzz.zzz.zzz.zzz\",\n  \"request_time\": 0,\n  \"upstream_response_time\": \"\",\n  \"upstream_header_time\": \"\",\n  \"http_accept_language\": \"-language\",\n  \"response_status\": 0,\n  \"request\": \"\",\n  \"host\": \"example.com\",\n  \"upstream_addr\": \"\",\n  \"http_referrer\": \"\",\n  \"request_length\": 5854,\n  \"bytes_sent\": 0,\n  \"http_user_agent\": \"\"\n}\n<\/code><\/pre>\n
<\/a><\/noindex>
\nAt l\u00e6se dokumentation og google om emnet gav ingenting \u2014 da det h\u00e6vdes, at s\u00e5dan adf\u00e6rd opst\u00e5r, n\u00e5r klienten har lukket forbindelsen uden at sende overskrifter. Og s\u00e5 var der forskellig eksotisme med st\u00f8rrelsen p\u00e5 bufferen for wsgi_, hvilket i vores tilf\u00e6lde ikke passede p\u00e5 nogen m\u00e5de.<\/p>\n
Generelt besluttede vi, at problemet ikke var et problem, da det under vores volumen slet ikke var kritisk.<\/p>\n
Lige indtil jeg blev konfronteret med det n\u00e6ste problem: i nogle tilf\u00e6lde \u00e5bnes links uden problemer via http, men n\u00e6gter fuldst\u00e6ndigt at fungere via https, hvilket giver en fantastisk besked: Connection #0 to host example.com left intact
\ncurl: (52) Tomt svar fra serveren<\/p>\n
I loggene kunne denne ting kun spores via IP \u2014 hverken request eller nogen andre data, som det kan ses fra eksemplet ovenfor \u2014 er der. Kun den berygtede status 0, men jeg ved jo, at jeg ikke afbr\u00f8d foresp\u00f8rgslen! Begyndte at kigge p\u00e5, hvad der kunne g\u00e5 galt. Og alt viste sig at v\u00e6re meget simpelt:<\/p>\n
listen 443 ssl<\/a> http2<\/b> backlog=8192;<\/i><\/p>\n
N\u00e5, s\u00e5dan er det \u2014 hvis man bruger http2 til ssl-forbindelser, s\u00e5 er det ikke nok bare at konfigurere buffere for requesten, de skal ogs\u00e5 konfigureres i ngx_http_v2_module, nemlig:<\/p>\n
Syntax:\thttp2_max_field_size st\u00f8rrelse;\nStandard:\thttp2_max_field_size 4k;\nKontext:\thttp, server\n<\/code><\/pre>\n
\nBegr\u00e6nser den maksimale st\u00f8rrelse af headers i en anmodning, der er komprimeret ved hj\u00e6lp af HPACK. Begr\u00e6nsningen g\u00e6lder ligeligt b\u00e5de for navnet og v\u00e6rdien. Hvis Huffman-kodning anvendes, kan den faktiske st\u00f8rrelse af de udpakkede navn- og v\u00e6rdi-strenge v\u00e6re st\u00f8rre. Standardbegr\u00e6nsningen passer til de fleste anmodninger.<\/i><\/p>\n
I det hele taget, det er det. Og hvorfor? Fordi l\u00e6ngden p\u00e5 linket var stor \u2014 mere end de der 4k.<\/p>\n
Ved at indstille det til, for eksempel, 8kb (eller s\u00e5 meget som sandsynligvis er tilstr\u00e6kkeligt) \u2014 l\u00f8ser vi problemet.
\nS\u00e5dan er det.
\n
Kilde: habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"
\u0421\u0442\u0430\u0442\u044c\u044f \u0438\u0437 \u0440\u0430\u0437\u0440\u044f\u0434\u0430 \u00ab\u0437\u0430\u043c\u0435\u0442\u043a\u0438 \u043d\u0430 \u043f\u043e\u043b\u044f\u0445\u00bb. TL:DR: http2_max_field_size 8k; # \u0432\u0441\u0435\u0445 \u0441\u043f\u0430\u0441\u0435\u0442! \u041d\u0430 \u043e\u0434\u043d\u043e\u043c \u0438\u0437 \u043f\u0440\u043e\u0435\u043a\u0442\u043e\u0432, \u043f\u043e\u0441\u043b\u0435 \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u044f \u043d\u0435\u043a\u043e\u0442\u043e\u0440\u043e\u0439 \u0432\u043d\u0443\u0442\u0440\u0435\u043d\u043d\u0435\u0439 \u043b\u043e\u0433\u0438\u043a\u0438 \u0431\u0435\u043a\u0435\u043d\u0434\u0430, \u043d\u0430\u0447\u0430\u043b \u043d\u0430\u0431\u043b\u044e\u0434\u0430\u0442\u044c \u0441\u0442\u0440\u0430\u043d\u043d\u044b\u0439 response_code \u0432 \u043b\u043e\u0433\u0430\u0445, \u0430 \u0438\u043c\u0435\u043d\u043d\u043e \u2014 0. \u0412 \u043b\u043e\u0433\u0430\u0445 \u0432\u044b\u0433\u043b\u044f\u0434\u0438\u0442 \u043f\u0440\u0438\u043c\u0435\u0440\u043d\u043e \u0442\u0430\u043a: { "timestamp": "2020-01-17T08:41:51+00:00", "remote_addr": "zzz.zzz.zzz.zzz", "request_time": 0, "upstream_response_time": "", "upstream_header_time": "", "http_accept_language": "-language", "response_status": 0, "request": "", "host": […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-55407","post","type-post","status-publish","format-standard","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47[Nginx] \u041a\u0430\u043a \u043f\u043e\u0431\u0435\u0434\u0438\u0442\u044c response_status = 0 | ProHoster","description":"Artikel i stil med \"notater i margen\". 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