301B Question #164: Real Exam Question with Answer & Explanation

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Question

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?

Options

AThe client request does NOT include a Host header.
BThe User-Agent header contains an invalid character.
CThe web server is NOT expecting a keep-alive connection.
DThe web server is configured to accept HTTP 1.0 requests only.

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