[ruby-core:69670] [Ruby trunk - Bug #11285] [Open] Net::HTTP should handle content-coding with case-insensitive

Issue #11285 has been reported by Andy Chu.

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Bug #11285: Net::HTTP should handle content-coding with case-insensitive 
https://bugs.ruby-lang.org/issues/11285

* Author: Andy Chu
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: 
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN
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When Ruby Net::HTTP sent a request. It by default set the content to be compress with header: Accept-Encoding

But if server return with content-encoding = GZIP (or any case other then all lower case) it will not tread the body as compressed.

According to HTTP 1.1 spec, Content-Encoding should be value used by content-coding, and the value of content-coding should be case-insensitive
content-coding: http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.5

I think simply change the code here: https://github.com/ruby/ruby/blob/trunk/lib/net/http/response.rb#L253

from

case self['content-encoding']

to 

case self['content-encoding'].downcase

should work





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