A web developer has created a custom HTTP call to a backend application.

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A web developer has created a custom HTTP call to a backend application. The HTTP headers being sent by the HTTP call are:

GET / HTTP/1.1

User-Agent: MyCustomApp (v1.0)

Accept: text/html

Cache-Control: no-cache

Connection: keep-alive

CookiE. somecookie=1

The backend server is responding with the following:

HTTP/1.1 400 Bad Request

DatE. Wed, 20 Jul 2012 17:22:41 GMT

Connection: close

Why is the HTTP web server responding with a HTTP 400 Bad Request?

The client request does NOT include a Host header.

The User-Agent header contains an invalid character.

The web server is NOT expecting a keep-alive connection.

The web server is configured to accept HTTP 1.0 requests only.

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