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Question 91

An LTM Specialist is troubleshooting an HTTP monitor. The pool member is accessible directly through a browser, but the HTTP monitor is marking the pool member as down.

GET / HTTP/1.1 -

HTTP/1.1 400 Bad Request -

DatE. Tue, 23 Oct 2012 21:39:07 GTM

Server: Apache/2.2.22 (FreeBSD) PHP/5.4.4

mod_ssl/2.2.22 OpenSSL/0.9.8q DAV/2

Content-LengtH. 226 -

Connection: close -

Content-TypE. text/html; charset=iso-8859-1

How should the LTM Specialist resolve this issue?

Add '200 OK' to the monitor's receive string.

Add 'Connection: close\r\n' to the monitor's send string.

Change the interval on the monitor from 5 seconds to 30 seconds.

Change the HTTP version in the send string from HTTP/1.1 to HTTP/1.0.

Correct Answer: D

The issue is that the HTTP monitor is sending an HTTP/1.1 request, which requires a 'Host' header. The response shows a '400 Bad Request' error, indicating that the request is invalid. By changing the HTTP version in the send string from HTTP/1.1 to HTTP/1.0, the 'Host' header is no longer required, and the pool member should be properly marked as up.

Discussion

Fer58Option: D

https://my.f5.com/manage/s/article/K2167 In an HTTP 1.0 request, no headers are required. However, in an HTTP 1.1 request, the Host header is required, although it may contain a null value.