{"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\/sk\/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":"

\u010cl\u00e1nok z kateg\u00f3rie \u201epozn\u00e1mky na okraji\u201c.<\/p>\n

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

http2_max_field_size 8k; # v\u0161etk\u00fdch zachr\u00e1ni!<\/code><\/pre>\n
Na jednom z projektov, po zmene ur\u010ditej vn\u00fatornej logiky backendu, som za\u010dal pozorova\u0165 zvl\u00e1\u0161tny response_code v logoch, a to konkr\u00e9tne \u2014 0. V logoch to vyzer\u00e1 pribli\u017ene takto:<\/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>
\n\u010c\u00edtanie dokument\u00e1cie a googlenie na t\u00fato t\u00e9mu dalo presne ni\u010d \u2014 preto\u017ee sa uv\u00e1dza, \u017ee tak\u00e9to spr\u00e1vanie nast\u00e1va, ke\u010f klient uzavrie spojenie a neodo\u0161le hlavi\u010dky. No a r\u00f4zne exotiky s ve\u013ekos\u0165ou buffera pre wsgi_, \u010do v na\u0161om pr\u00edpade v\u00f4bec nesedelo.<\/p>\n
Celkov\u011b jsme sa rozhodli, \u017ee probl\u00e9m nie je probl\u00e9m, s oh\u013eadom na to, \u017ee pri na\u0161ich objemoch to v\u00f4bec nie je kritick\u00e9.<\/p>\n
Presne do okamihu, k\u00fdm ma neznepokojila \u010fal\u0161ia ot\u00e1zka: v niektor\u00fdch pr\u00edpadoch sa odkazy bez probl\u00e9mov otv\u00e1raj\u00fa cez http, ale \u00faplne odmietaj\u00fa fungova\u0165 cez https, vyd\u00e1vaj\u00face z\u00e1zra\u010dn\u00e9: Connection #0 to host example.com left intact
\ncurl: (52) Pr\u00e1zdna odpove\u010f zo servera<\/p>\n
V logoch sa mi podarilo vystopova\u0165 t\u00fato vec len pod\u013ea IP \u2014 ani po\u017eiadavka, ani \u017eiadne in\u00e9 \u00fadaje, ako je vidie\u0165 z vy\u0161\u0161ie uveden\u00e9ho pr\u00edkladu \u2014 nie s\u00fa. Iba presl\u00e1ven\u00fd status 0, ale ja viem, \u017ee som po\u017eiadavku nepreru\u0161il! Za\u010dal som sk\u00fama\u0165, \u010do sa m\u00f4\u017ee pokazi\u0165. A v\u0161etko sa uk\u00e1zalo by\u0165 ve\u013emi jednoduch\u00e9:<\/p>\n
listen 443 ssl<\/a> http2<\/b> backlog=8192;<\/i><\/p>\n
No tak \u2014 ak sa pou\u017e\u00edva http2 pre ssl-pripojenia, nesta\u010d\u00ed len konfigurova\u0165 buffery po\u017eiadavky, treba ich konfigurova\u0165 aj v ngx_http_v2_module, a to konkr\u00e9tne:<\/p>\n
Syntax:\thttp2_max_field_size ve\u013ekos\u0165;\nPredvolen\u00e9:\thttp2_max_field_size 4k;\nKontext:\thttp, server\n<\/code><\/pre>\n
\nObmedzuje maxim\u00e1lnu ve\u013ekos\u0165 hlavi\u010dky po\u017eiadavky, komprimovanej pomocou HPACK. Obmedzenie sa uplat\u0148uje rovnako na n\u00e1zov, ako aj na hodnotu. Ak sa pou\u017e\u00edva Huffmanovo k\u00f3dovanie, skuto\u010dn\u00e1 ve\u013ekos\u0165 dekomprimovan\u00fdch re\u0165azcov n\u00e1zvu a hodnoty m\u00f4\u017ee by\u0165 v\u00e4\u010d\u0161ia. Predvolen\u00e9 obmedzenie vyhovuje v\u00e4\u010d\u0161ine po\u017eiadaviek.<\/i><\/p>\n
V podstate to je ono. A pre\u010do? Preto\u017ee d\u013a\u017eka odkazu bola ve\u013ek\u00e1 \u2014 v\u00e4\u010d\u0161ia, ako t\u00fdch presl\u00e1ven\u00fdch 4k.<\/p>\n
Nastaven\u00edm na napr\u00edklad 8kb (alebo to\u013eko, ko\u013eko ur\u010dite sta\u010d\u00ed) \u2014 vyrie\u0161ime probl\u00e9m.
\nTak to je.
\n
Zdroj: 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":"\u010cl\u00e1nok zo s\u00e9rie \"pozn\u00e1mky na okraji\". 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