{"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\/nl\/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":"

Een artikel van het type 'aantekeningen aan de rand'.<\/p>\n

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

http2_max_field_size 8k; # alles zal goedkomen!<\/code><\/pre>\n
Op een van de projecten begon ik een vreemd response_code in de logboeken te zien, namelijk \u2014 0, na een wijziging in bepaalde interne logica van de backend. In de logboeken ziet het er ongeveer zo uit:<\/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>
\nHet lezen van de documentatie en googelen over dit onderwerp leverde helemaal niets op \u2014 omdat beweerd wordt dat dit gedrag optreedt wanneer de client de verbinding sluit zonder headers te verzenden. En allerlei exotica met de buffergrootte voor wsgi_, wat in ons geval totaal niet van toepassing was.<\/p>\n
Over het algemeen hebben we besloten dat het probleem g\u00e9\u00e9n probleem is, gezien het feit dat het bij onze volumes helemaal niet kritisch is.<\/p>\n
Juist tot het moment dat ik met het volgende probleem werd geconfronteerd: in sommige gevallen kunnen links probleemloos via http worden geopend, maar weigeren ze volledig om via https te werken, met de prachtige melding: Connection #0 to host example.com left intact
\ncurl: (52) Leeg antwoord van de server<\/p>\n
In de logboeken kon ik dit alleen volgen via IP \u2014 noch request, noch andere gegevens, zoals uit het bovenstaande voorbeeld blijkt \u2014 zijn beschikbaar. Alleen de beruchte status 0, maar ik weet dat ik de request niet heb afgebroken! Ik begon te graven wat er fout kon gaan. En het bleek heel eenvoudig:<\/p>\n
listen 443 ssl<\/a> http2<\/b> backlog=8192;<\/i><\/p>\n
Nou, dus als http2 voor ssl-verbindingen wordt gebruikt, is het niet voldoende om alleen de aanvraagbuffers te configureren; deze moeten ook in ngx_http_v2_module worden geconfigureerd, namelijk:<\/p>\n
Syntax:\thttp2_max_field_size size;\nStandaard:\thttp2_max_field_size 4k;\nContext:\thttp, server\n<\/code><\/pre>\n
\nBeperkt de maximale grootte van de aanvraagheader, gecomprimeerd met behulp van HPACK. De beperking is van toepassing op zowel de naam als de waarde. Als Huffman-codering wordt toegepast, kan de werkelijke grootte van de gedecomprimeerde naam- en waarde-strings groter zijn. De standaardlimiet is geschikt voor de meeste aanvragen.<\/i><\/p>\n
In het algemeen is dit het. En waarom? Omdat de lengte van de link groot was \u2014 groter dan diezelfde 4k.<\/p>\n
Door deze bijvoorbeeld in te stellen op 8kb (of zoveel als zeker voldoende is) \u2014 lossen we het probleem op.
\nDat is het.
\n
Bron: 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":"Een artikel uit de categorie 'aantekeningen aan de rand'. TL:DR: http2_max_field_size 8k; # zal iedereen redden! 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