Issue #5843 has been updated by Yui NARUSE.


Arguments given to URI.build must be escaped.
You must escape \n by yourself.

Anyway it is a bug, URI.build must raise URI::InvalidComponentError.
I'll fix it.
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Bug #5843: URI::HTTP and Net::HTTP do not escape \n characters in the query-string
https://bugs.ruby-lang.org/issues/5843

Author: Hal Brodigan
Status: Open
Priority: Normal
Assignee: akira yamada
Category: lib
Target version: 
ruby -v: ruby 1.9.3p0 (2011-10-30 revision 33570) [x86_64-linux]


When building new URI::HTTP objects, \n characters in the query-string are not escaped. An unescaped \n character will cause two lines to be sent to an HTTP Server when passed to Net::HTTP.get, which causes parsing errors.

    require 'uri/http'
    require 'net/http'
    
    uri = URI::HTTP.build(:host => 'www.example.com', :path => '/', :query => "hello\nworld")
    Net::HTTP.get(uri)

    00000000  47 45 54 20 2f 3f 68 65  6c 6c 6f 0a 77 6f 72 6c GET /?he llo.worl
    00000010  64 20 48 54 54 50 2f 31  2e 31 0d 0a 41 63 63 65 d HTTP/1 .1..Acce
    00000020  70 74 3a 20 2a 2f 2a 0d  0a 55 73 65 72 2d 41 67 pt: */*. .User-Ag
    00000030  65 6e 74 3a 20 52 75 62  79 0d 0a 48 6f 73 74 3a ent: Rub y..Host:
    00000040  20 77 77 77 2e 65 78 61  6d 70 6c 65 2e 63 6f 6d  www.exa mple.com
    00000050  0d 0a 0d 0a                                      ....



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