{"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\/es\/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":"

Art\u00edculo del tipo \u00abnotas al margen\u00bb.<\/p>\n

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

http2_max_field_size 8k; # \u00a1todos se salvar\u00e1n!<\/code><\/pre>\n
En uno de los proyectos, despu\u00e9s de cambiar cierta l\u00f3gica interna del backend, comenc\u00e9 a observar un extra\u00f1o response_code en los registros, a saber \u2014 0. En los registros, se ve algo as\u00ed:<\/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>
\nLeer la documentaci\u00f3n y buscar en Google sobre este tema no result\u00f3 en nada \u2014 ya que se afirma que tal comportamiento ocurre cuando el cliente cerr\u00f3 la conexi\u00f3n sin enviar los encabezados. Y adem\u00e1s, hab\u00eda diversas ex\u00f3ticas con el tama\u00f1o del b\u00fafer para wsgi_, que en nuestro caso no serv\u00edan para nada.<\/p>\n
En general, decidimos que el problema no era un problema, dado que con nuestros vol\u00famenes no es cr\u00edtico en absoluto.<\/p>\n
Exactamente hasta el momento en que me plantearon el siguiente problema: en algunos casos, los enlaces se abren sin problemas por http, pero se niegan a funcionar completamente por https, arrojando algo maravilloso: Connection #0 to host example.com left intact
\ncurl: (52) Respuesta vac\u00eda del servidor<\/p>\n
En los registros, solo logr\u00e9 rastrear esta cosa por IP \u2014 no hab\u00eda petici\u00f3n, ni ning\u00fan otro dato, como se puede ver en el ejemplo anterior \u2014 nada. Solo el infame estado 0, pero yo s\u00e9 que \u00a1no interrump\u00ed la solicitud! Comenc\u00e9 a investigar qu\u00e9 podr\u00eda salir mal. Y result\u00f3 ser muy simple:<\/p>\n
listen 443 ssl<\/a> http2<\/b> backlog=8192;<\/i><\/p>\n
As\u00ed que, si se utiliza http2 para conexiones ssl, simplemente configurar los b\u00faferes de solicitud no es suficiente, hay que configurarlos tambi\u00e9n en ngx_http_v2_module, y espec\u00edficamente:<\/p>\n
Sintaxis:\thttp2_max_field_size tama\u00f1o;\nValor predeterminado:\thttp2_max_field_size 4k;\nContexto:\thttp, server\n<\/code><\/pre>\n
\nLimita el tama\u00f1o m\u00e1ximo del encabezado de la solicitud, comprimido mediante HPACK. El l\u00edmite se aplica igual tanto al nombre como al valor. Si se aplica la codificaci\u00f3n de Huffman, el tama\u00f1o real de las cadenas desempaquetadas del nombre y el valor puede ser mayor. El l\u00edmite predeterminado es adecuado para la mayor\u00eda de las solicitudes.<\/i><\/p>\n
En resumen, eso es todo. \u00bfY todo por qu\u00e9? Porque la longitud del enlace era grande \u2014 m\u00e1s de esos 4k.<\/p>\n
Al configurarlo, por ejemplo, a 8kb (o lo que asegure que ser\u00e1 suficiente) \u2014 resolvemos el problema.
\nEso es todo.
\n
Fuente: 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":"Art\u00edculo del tipo \"notas al margen\". 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