{"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\/it\/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":"

Articolo del tipo \u00abappunti nel margine\u00bb.<\/p>\n

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

http2_max_field_size 8k; # tutti salveranno!<\/code><\/pre>\n
In un progetto, dopo aver modificato una certa logica interna del backend, ho iniziato a notare un strano response_code nei log, precisamente \u2014 0. Nei log appare pi\u00f9 o meno cos\u00ec:<\/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>
\nLeggere la documentazione e cercare su Google su questo argomento non ha portato a nulla \u2014 poich\u00e9 si afferma che tale comportamento si verifica quando il client ha chiuso la connessione senza inviare le intestazioni. E un po' di stranezze con la dimensione del buffer per wsgi_, che nel nostro caso non \u00e8 affatto adatta.<\/p>\n
In generale, abbiamo deciso che il problema non \u00e8 un problema, considerando che nei nostri volumi non \u00e8 affatto critico.<\/p>\n
Fino al momento in cui non mi \u00e8 stata posta la seguente domanda: in alcuni casi i link si aprono senza problemi tramite http, ma rifiutano categoricamente di funzionare tramite https, restituendo un meraviglioso: Connection #0 to host example.com left intact
\ncurl: (52) Risposta vuota dal server<\/p>\n
Nei log, \u00e8 stato possibile risalire a questa cosa solo tramite IP \u2014 n\u00e9 richieste n\u00e9 altri dati, come si pu\u00f2 vedere dall'esempio sopra \u2014 ci sono. Solo il famigerato stato 0, ma so che non ho interrotto la richiesta! Ho iniziato a scavare su cosa potesse andare storto. E la soluzione \u00e8 stata molto semplice:<\/p>\n
listen 443 ssl<\/a> http2<\/b> backlog=8192;<\/i><\/p>\n
Quindi, se si utilizza http2 per connessioni ssl, non basta configurare solo i buffer della richiesta, ma \u00e8 necessario configurarli anche in ngx_http_v2_module, e precisamente:<\/p>\n
Sintassi:\thttp2_max_field_size dimensione;\nValore predefinito:\thttp2_max_field_size 4k;\nContesto:\thttp, server\n<\/code><\/pre>\n
\nLimita la dimensione massima dell'intestazione della richiesta, compressa con HPACK. Il limite si applica ugualmente sia al nome che al valore. Se viene utilizzata la codifica di Huffman, la dimensione effettiva delle stringhe non compresse pu\u00f2 essere maggiore. Il limite predefinito \u00e8 adeguato per la maggior parte delle richieste.<\/i><\/p>\n
In generale, \u00e8 questo. E perch\u00e9? Perch\u00e9 la lunghezza del link era grande \u2014 pi\u00f9 di 4k.<\/p>\n
Impostandolo, ad esempio, su 8kb (o quanto basta sicuramente) \u2014 risolviamo il problema.
\nEcco fatto.
\n
Fonte: habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"
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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\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":"Un articolo del tipo \u00abnote a margine\u00bb. 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