为什么 Microsoft-HTTPAPI 将 404 返回到我的网络交换机？

Question

客户端 (IE) 对静态 html keep_alive 页面的请求似乎工作得很好，但是在使用相同的 EXACT URL 时，执行负载平衡的网络交换机似乎无法请求相同的页面。来自交换机的 HTTPERR 日志条目给出404-NotFound -。它显然没有进入 IIS 但为什么 HTTPAPI 会拒绝这个？我在哪里可以看到原因代码或错误消息，或其他什么？请帮忙:|

摘自 HTTPERR：网络交换机的请求失败（IP 已删除）

2013-02-14 18:34:55 X.X.X.X 38676 X.X.X.X 80 HTTP/1.1 HEAD /keep_alive.html 404 - NotFound -

当交换机尝试获取页面时，这每隔几秒钟重复一次。

从我的故障排除中捕获的网络帧：

NETWORK SWITCH

- HTTP: Request, HEAD /keep_alive.html 
    Command: HEAD
  - URI: /keep_alive.html
     Location: /keep_alive.html 
    ProtocolVersion: HTTP/1.1
    Host:  X.X.X.X
    Connection:  Close
    HeaderEnd: CRLF

- HTTP: Response, HTTP/1.1, Status: Not found, URL: 
    ProtocolVersion: HTTP/1.1
    StatusCode: 404, Not found
    Reason: Not Found
    ContentLength:  315
  - ContentType:  text/html; charset=us-ascii
   + MediaType:  text/html; charset=us-ascii
    Server:  Microsoft-HTTPAPI/2.0
    Date:  Fri, 15 Feb 2013 16:52:52 GMT
    Connection:  close
    HeaderEnd: CRLF

DESKTOP

- HTTP: Request, GET /keep_alive.html 
    Command: GET
  - URI: /keep_alive.html
     Location: /keep_alive.html 
    ProtocolVersion: HTTP/1.1
    Accept:  application/x-ms-application, image/jpeg, application/xaml+xml, image/gif, image/pjpeg, application/x-ms-xbap, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*
    Accept-Language:  en-US
    UserAgent:  Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET CLR 1.1.4322; .NET4.0C; .NET4.0E)
    Accept-Encoding:  gzip, deflate
    Host:  X.X.X.X
    Connection:  Keep-Alive
  - Cookie:  ...  

- Http: Response, HTTP/1.1, Status: Ok, URL: /keep_alive.html 
    ProtocolVersion: HTTP/1.1
    StatusCode: 200, Ok
    Reason: OK
  - ContentType:  text/html
     MediaType:  text/html
    ContentEncoding:  gzip
    Last-Modified:  Fri, 26 Feb 2010 05:11:00 GMT
    Accept-Ranges:  bytes
    ETag:  "0aca15a2b6ca1:0"
    Vary:  Accept-Encoding
    Server:  Microsoft-IIS/7.5
    XPoweredBy:  ASP.NET
    Date:  Fri, 15 Feb 2013 17:15:13 GMT
    ContentLength:  1514
    HeaderEnd: CRLF
  - payload: HttpContentType =  text/html
     HtmlElement: ...

Answer 1

找到了解决办法。

问题出在 IIS 中的绑定配置上。网络交换机根据IP地址生成请求。在来自网络交换机的请求帧中（如上所示），您会注意到该Host值作为 IP 地址传递。缺乏适当的绑定显然只会在 HTTPERR 日志中返回这种性质的 404。我们的 IIS 配置仅包含 DNS 名称的绑定。

长话短说

确保您的 IIS 绑定包含 IP 和 DNS 的条目，否则您会遇到麻烦。