{"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\/sv\/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 av typen \"anteckningar p\u00e5 marginalen.\"<\/p>\n

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

http2_max_field_size 8k; # r\u00e4ddar alla!<\/code><\/pre>\n
P\u00e5 ett av projekten, efter att ha \u00e4ndrat en del intern logik i backend, b\u00f6rjade jag se en konstig response_code i loggarna, n\u00e4mligen \u2014 0. I loggarna ser det ungef\u00e4r ut s\u00e5 h\u00e4r:<\/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>
\nAtt l\u00e4sa dokumentationen och googla om \u00e4mnet gav mig ingenting \u2014 eftersom det p\u00e5st\u00e5s att s\u00e5dant beteende uppst\u00e5r n\u00e4r klienten har st\u00e4ngt anslutningen utan att skicka n\u00e5gra rubriker. Och att det finns olika exotiska saker med bufferstorlekar f\u00f6r wsgi_, vilket i v\u00e5rt fall var helt ol\u00e4mpligt.<\/p>\n
I det stora hela beslutade vi att problemet \u2014 inte \u00e4r ett problem, med tanke p\u00e5 att vid v\u00e5ra volymer \u00e4r det helt ovidkommande.<\/p>\n
Precis tills jag blev utmanad med n\u00e4sta problem: i vissa fall \u00f6ppnas l\u00e4nkar utan problem \u00f6ver http, men v\u00e4grar helt att fungera \u00f6ver https, vilket ger ett underbart: Connection #0 to host example.com left intact
\ncurl: (52) Tomt svar fr\u00e5n servern<\/p>\n
I loggarna kunde man bara sp\u00e5ra detta genom IP \u2014 varken beg\u00e4ran eller n\u00e5gon annan information, som man kan se i exemplet ovan \u2014 finns. Endast den vansinniga statusen 0, men jag vet ju att jag inte avbr\u00f6t beg\u00e4ran! Jag b\u00f6rjade gr\u00e4va i vad som kunde g\u00e5 fel. Och allt visade sig vara v\u00e4ldigt enkelt:<\/p>\n
listen 443 ssl<\/a> http2<\/b> backlog=8192;<\/i><\/p>\n
S\u00e5, om man anv\u00e4nder http2 f\u00f6r ssl-anslutningar, r\u00e4cker det inte bara att konfigurera beg\u00e4rans buffertar, man m\u00e5ste ocks\u00e5 konfigurera dem i ngx_http_v2_module, n\u00e4mligen:<\/p>\n
Syntax:\thttp2_max_field_size storlek;\nStandard:\thttp2_max_field_size 4k;\nKontext:\thttp, server\n<\/code><\/pre>\n
\nBegr\u00e4nsar den maximala storleken p\u00e5 en beg\u00e4rans rubrik, komprimerad med HPACK. Begr\u00e4nsningen g\u00e4ller lika b\u00e5de namn och v\u00e4rde. Om Huffman-kodning anv\u00e4nds kan den faktiska storleken p\u00e5 de uppackade str\u00e4ngerna f\u00f6r namn och v\u00e4rde vara st\u00f6rre. Standardbegr\u00e4nsningen passar de flesta beg\u00e4rningar.<\/i><\/p>\n
\u00d6verlag, s\u00e5 \u00e4r det. Och varf\u00f6r? F\u00f6r att l\u00e4ngden p\u00e5 l\u00e4nken var stor \u2014 st\u00f6rre \u00e4n just de 4 k.<\/p>\n
Genom att st\u00e4lla in det p\u00e5, till exempel, 8kb (eller s\u00e5 mycket som s\u00e4kert beh\u00f6vs) \u2013 l\u00f6ser vi problemet.
\nS\u00e5dana \u00e4r f\u00f6rh\u00e5llandena.
\n
K\u00e4lla: 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 av typen \"noteringar i marginalerna\". TL:DR: http2_max_field_size 8k; # allt kan r\u00e4ddas! 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