subsegment name special characters

[thehesiod]

currently the following is allowed: string.ascii_letters + string.digits + '_.:/%&#=+\-@ ' per entity.py. However in the requests module (and httplib module I'm proposing based on it) it uses the url, which can include a ? character which yields a lot of warnings. Was the intention that everything after '?' would be stripped off? If so the requests module isn't doing this either. Could either do simple string clipping or use something like yarl

[haotianw465]

Query string with "?" should not be part of a subsegment name. This is a bug. We will looking into a fix. A PR is also welcome.

[thehesiod]

Ok cool, I'll add it to my httplib PR