User Agent: Linux and Request Method: HEAD

HEAD /URI-TESTING HTTP/1.1

Host: applicationtesting.abc.com

User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:10.0) Gecko/20150101 Firefox/47.0 (Chrome)

Accept: text/html,application/xhtml+xml,application/xml;q=0.9,/;q=0.8

Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7

Accept-Language: en-us,en;q=0.5 Connection: close

X-Forwarded-For: IP Address

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We are observing the HEAD request when we see the user agent X11, Linux HEAD is considered the not allowed method.

But why it is coming with Linux as per user agent.