调查凤凰应用程序中的牛仔/牛库/牧场异常答案

【问题标题】：Investigating cowboy / cowlib / ranch exceptions in phoenix app调查凤凰应用程序中的牛仔/牛库/牧场异常
【发布时间】：2017-09-04 04:08:46
【问题描述】：

我有一个 phoenix 应用程序，它在生产中不断引发多个不同的异常。我正在尝试调查异常，但我不确定我的端点配置是否错误，这些错误是否存在于依赖项中？这些问题是否相关？哪个依赖项对它们负责？

我不想开票并在不同项目之间开始乒乓对话，所以我想先在这里问。

依赖关系

牛仔：1.0.4
cowlib：1.0.2
牧场：1.2.1
凤凰：1.2

例外情况

17:58:21.973 [error] Ranch protocol #PID<0.8216.13> (:cowboy_protocol) of listener Krihelinator.Endpoint.HTTP terminated
** (exit) an exception was raised:
   ** (FunctionClauseError) no function clause matching in :cowboy_protocol.parse_method/3
        (cowboy) src/cowboy_protocol.erl:168: :cowboy_protocol.parse_method("", {:state, #Port<0.19168>, :ranch_tcp, [:cowboy_router, :cowboy_handler], true, [listener: Krihelinator.Endpoint.HTTP, dispatch: [{:_, [], [{["socket", "websocket"], [], Phoenix.Endpoint.CowboyWebSocket, {Phoenix.Transports.WebSocket, {Krihelinator.Endpoint, Krihelinator.UserSocket, :websocket}}}, {:_, [], Plug.Adapters.Cowboy.Handler, {Krihelinator.Endpoint, []}}]}]], :undefined, :undefined, 5, 1, 100, 4096, 64, 4096, 100, 5000, 1490810306970}, <<0, 0, 0, 113, 106, 129, 110, 48, 129, 107, 161, 3, 2, 1, 5, 162, 3, 2, 1, 10, 164, 129, 94, 48, 92, 160, 7, 3, 5, 0, 80, 128, 0, 16, 162, 4, 27, 2, 78, 77, 163, 23, 48, 21, 160, 3, 2, 1, 0, 161, ...>>)

2017-04-06 06:21:14.693 [error] Ranch protocol #PID<0.21785.1> (:cowboy_protocol) of listener Krihelinator.Endpoint.HTTP terminated
** (exit) an exception was raised:
    ** (FunctionClauseError) no function clause matching in :cowboy_protocol.parse_uri_path/4
        (cowboy) src/cowboy_protocol.erl:200: :cowboy_protocol.parse_uri_path("", {:state, #Port<0.6072>, :ranch_tcp, [:cowboy_router, :cowboy_handler], true, [listener: Krihelinator.Endpoint.HTTP, dispatch: [{:_, [], [{["socket", "websocket"], [], Phoenix.Endpoint.CowboyWebSocket, {Phoenix.Transports.WebSocket, {Krihelinator.Endpoint, Krihelinator.UserSocket, :websocket}}}, {:_, [], Plug.Adapters.Cowboy.Handler, {Krihelinator.Endpoint, []}}]}]], :undefined, :undefined, 5, 1, 100, 4096, 64, 4096, 100, 5000, 1491459679639}, <<71, 104, 48, 115, 116, 173, 0, 0, 0, 224, 0, 0, 0, 120, 156, 75, 83, 96, 96, 152, 195, 192, 192, 192, 6, 196, 140, 64, 188, 81, 150, 129, 129, 9, 72, 7, 167, 22, 149, 101, 38, 167, 42, 4, 36, 38, 103, 43, 24, 50, ...>>, <<2, 0, 84, 245, 43, 92>>)

18:20:18.395 [error] Ranch protocol #PID<0.28926.18> (:cowboy_protocol) of listener Krihelinator.Endpoint.HTTP terminated
** (exit) an exception was raised:
    ** (FunctionClauseError) no function clause matching in :cow_http_hd.token_ci_list_sep/3
        (cowlib) src/cow_http_hd.erl:191: :cow_http_hd.token_ci_list_sep("Te", [], "keep-alive")
        (cowlib) src/cow_http_hd.erl:31: :cow_http_hd.parse_connection/1
        (cowboy) src/cowboy_req.erl:189: :cowboy_req.new/14
        (cowboy) src/cowboy_protocol.erl:410: :cowboy_protocol.request/9

如您所见，我不知道为什么会出现这些问题。所以也许我没有提供足够的信息。如果需要，请询问更多。任何帮助我解决这些问题或打开正确项目票证的指导将不胜感激。

【问题讨论】：

标签： phoenix cowboy

【解决方案1】：

客户端发送了一个无效的keepalive标头，cowboy对此非常严格，见https://github.com/ninenines/cowboy/issues/943

如果您知道客户端，您可以要求修复，或在代理中重写标头，例如代理服务器

  # cowboy crashes when invalid headers are sent
  # see https://github.com/ninenines/cowboy/issues/943
  acl invalid_keepalive_header hdr(Connection) -i keep-alive\ Te
  reqirep ^Connection:\ keep-alive\ Te  Connection:\ keep-alive,\ Te if invalid_keepalive_header

  acl invalid_keepalive_header_1 hdr(Connection) -i Te\ keep-alive
  reqirep ^Connection:\ Te\ keep-alive  Connection:\ keep-alive,\ Te if invalid_keepalive_header_1

【讨论】：