Issue #4551 has been updated by naruse (Yui NARUSE).

Assignee changed from naruse (Yui NARUSE) to drbrain (Eric Hodel)

I agree with this.
Please commit it.
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Feature #4551: uri.set_scheme should downcase schemes
https://bugs.ruby-lang.org/issues/4551#change-24941

Author: drbrain (Eric Hodel)
Status: Assigned
Priority: Normal
Assignee: drbrain (Eric Hodel)
Category: lib
Target version: 


=begin
From RFC 2396 section 3.1:

"For resiliency, programs interpreting URI should treat upper case letters as equivalent to lower case in scheme names (e.g., allow 'HTTP' as well as 'http')."

Currently programs using URI for HTTP vs HTTPS protocol check which protocol to use with a comparison like:

 http.use_ssl = uri.scheme == 'https'

Since URI does not modify the input scheme this makes the check fragile.  For example:

 URI.parse('httpS://example').scheme # => "httpS"

Since RFC 2396 allows uppercase letters to be treated like lowercase I think #set_scheme should downcase its value.
=end



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