hgweb: put response headers back into str for Python 3
This fixes a lot of hanging tests on Python 3, because
"Content-Length" was getting sent as "b'Content-Length'" (yes, really)
and then clients would expect a close-is-end body instead of counting
off a certain number of bytes.
Differential Revision: https://phab.mercurial-scm.org/D3248
{
// Enforcing
"eqeqeq" : true, // true: Require triple equals (===) for comparison
"forin" : true, // true: Require filtering for..in loops with obj.hasOwnProperty()
"freeze" : true, // true: prohibits overwriting prototypes of native objects such as Array, Date etc.
"nonbsp" : true, // true: Prohibit "non-breaking whitespace" characters.
"undef" : true, // true: Require all non-global variables to be declared (prevents global leaks)
// Environments
"browser" : true // Web Browser (window, document, etc)
}