{"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\/hu\/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":"

A cikk a \u201emell\u00e9kjegyzetek\u201d kateg\u00f3ri\u00e1j\u00e1ba tartozik.<\/p>\n

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

http2_max_field_size 8k; # mindenki meg fog menteni!<\/code><\/pre>\n
Egyik projekt\u00fcnk sor\u00e1n, miut\u00e1n m\u00f3dos\u00edtottuk a backend n\u00e9h\u00e1ny bels\u0151 logik\u00e1j\u00e1t, furcsa response_code-ot kezdtem \u00e9szlelni a napl\u00f3ban, nevezetesen \u2014 0-t. A napl\u00f3ban k\u00f6r\u00fclbel\u00fcl \u00edgy n\u00e9z ki:<\/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\": \"-nyelv\",\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>
\nA dokument\u00e1ci\u00f3 olvas\u00e1sa \u00e9s a t\u00e9ma k\u00f6r\u00fcli googliz\u00e1s nem hozott semmit \u2014 mivel \u00e1ll\u00edt\u00f3lag ez a viselked\u00e9s akkor fordul el\u0151, amikor a kliens a fejl\u00e9cek tov\u00e1bb\u00edt\u00e1sa n\u00e9lk\u00fcl z\u00e1rja be a kapcsolatot. \u00c9s k\u00fcl\u00f6nf\u00e9le egzotikumok a wsgi_ puffer m\u00e9ret\u00e9vel kapcsolatban, ami eset\u00fcnkben szint\u00e9n egy\u00e1ltal\u00e1n nem volt megfelel\u0151.<\/p>\n
\u00d6sszess\u00e9g\u00e9ben \u00fagy d\u00f6nt\u00f6tt\u00fcnk, hogy a probl\u00e9ma \u2014 nem probl\u00e9ma, figyelembe v\u00e9ve, hogy a mi volumeneink mellett ez egy\u00e1ltal\u00e1n nem kritikus.<\/p>\n
Pont addig a pillanatig, am\u00edg nem szembes\u00fcltem a k\u00f6vetkez\u0151 probl\u00e9m\u00e1val: bizonyos esetekben a linkek probl\u00e9mamentesen ny\u00edlnak meg http-n, de teljesen elutas\u00edtj\u00e1k a m\u0171k\u00f6d\u00e9st https-en, csod\u00e1s \u00fczenetet adva: Connection #0 to host example.com left intact
\ncurl: (52) \u00dcres v\u00e1lasz a szervert\u0151l<\/p>\n
A napl\u00f3kban ezt csak IP alapj\u00e1n siker\u00fclt nyomon k\u00f6vetni \u2014 se k\u00e9r\u00e9st, se egy\u00e9b adatokat, ahogy az fentebbi p\u00e9ld\u00e1b\u00f3l is l\u00e1tszik \u2014 nincs. Csak a h\u00edres 0-\u00e1s st\u00e1tusz, de tudom, hogy a k\u00e9r\u00e9s nem szakadt meg! Elkezdtem kutakodni, hogy mi mehetett el rosszul. \u00c9s minden nagyon egyszer\u0171en alakult:<\/p>\n
listen 443 ssl<\/a> http2<\/b> backlog=8192;<\/i><\/p>\n
Sz\u00f3val \u2014 ha http2-t haszn\u00e1lunk ssl-kapcsolatokhoz, akkor nem el\u00e9g csak a k\u00e9r\u00e9s puffereit konfigur\u00e1lni, hanem azokat is be kell \u00e1ll\u00edtani az ngx_http_v2_module-ban, nevezetesen:<\/p>\n
Szintaxis:\thttp2_max_field_size m\u00e9ret;\nAlap\u00e9rtelmez\u00e9s:\thttp2_max_field_size 4k;\nKontekstus:\thttp, server\n<\/code><\/pre>\n
\nKorl\u00e1tozza a HPACK seg\u00edts\u00e9g\u00e9vel t\u00f6m\u00f6r\u00edtett k\u00e9r\u00e9s fejl\u00e9c\u00e9nek maxim\u00e1lis m\u00e9ret\u00e9t. A korl\u00e1toz\u00e1s egyar\u00e1nt vonatkozik a n\u00e9vre \u00e9s az \u00e9rt\u00e9kre. Ha Huffman k\u00f3dol\u00e1st alkalmazunk, akkor az \u00e9szlelhet\u0151 kib\u0151v\u00edtett n\u00e9v \u00e9s \u00e9rt\u00e9k t\u00e9nyleges m\u00e9rete nagyobb lehet. Az alap\u00e9rt\u00e9k a legt\u00f6bb k\u00e9relemhez megfelel\u0151.<\/i><\/p>\n
Sz\u00f3val, ez az. \u00c9s mi\u00e9rt? Mert a hivatkoz\u00e1s hossza nagy volt \u2014 nagyobb, mint a bizonyos 4k.<\/p>\n
Ha p\u00e9ld\u00e1ul 8kb-ra \u00e1ll\u00edtjuk (vagy annyira, amennyi biztosan el\u00e9g lesz) \u2014 megoldjuk a probl\u00e9m\u00e1t.
\nEzek a dolgok.
\n
Forr\u00e1s: 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. 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