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The change introduced in #138 disallows bare LFs in headers and request lines. This change is good, but it also affects CGIHandler, causing scripts that use bare LF as a header separator to fail. However, according to RFC 3875, unlike HTTP, bare LFs are allowed in CGI header syntax.
For example, the following CGI script will fail when run under WEBrick 1.8 and later:
#!/usr/bin/ruby
print "Content-Type: text/html\n"
print "\n"
print "<html>example</html>"In this case, the error message displayed in the browser is:
bad header 'Content-Type: text/html '.
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