301b Exam Dumps | A web developer has created a custom HTTP call to a backend application. The HTTP headers being sent

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Question 111/205

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?

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

B. The User-Agent header contains an invalid character.

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

D. The client request does NOT include a Host header.

Recent Comments (The most recent comments are at the top.)

Nitratic - Jun 06, 2025

In HTTP/1.1, the Host header is mandatory for every request. According to RFC 2616,
“A client must include a Host Header filed in all HTTP/1.1 request messages.”

There is no Host: header, which is required for the server to determine which virtual host (domain) the client is trying to reach, especially on servers hosting multiple websites (virtual hosting).

When a server receives an HTTP/1.1 request without a Host header, it will typically respond with:

HTTP/1.1 400 Bad Request

Question 111/205

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