Added test for http11 choosing response type without content-type header.
Added test for http11 choosing response type without content-type header.

finfish/scrapy,starrify/scrapy,crasker/scrapy,darkrho/scrapy-scrapy,foromer4/scrapy,starrify/scrapy,w495/scrapy,ssteo/scrapy,foromer4/scrapy,darkrho/scrapy-scrapy,wenyu1001/scrapy,pawelmhm/scrapy,wujuguang/scrapy,crasker/scrapy,YeelerG/scrapy,taito/scrapy,wenyu1001/scrapy,GregoryVigoTorres/scrapy,redapple/scrapy,taito/scrapy,Ryezhang/scrapy,barraponto/scrapy,barraponto/scrapy,Parlin-Galanodel/scrapy,rolando/scrapy,umrashrf/scrapy,Parlin-Galanodel/scrapy,kmike/scrapy,jc0n/scrapy,finfish/scrapy,wujuguang/scrapy,dangra/scrapy,pawelmhm/scrapy,rolando/scrapy,arush0311/scrapy,kmike/scrapy,Ryezhang/scrapy,crasker/scrapy,darkrho/scrapy-scrapy,eLRuLL/scrapy,elacuesta/scrapy,ArturGaspar/scrapy,taito/scrapy,rolando/scrapy,barraponto/scrapy,rootAvish/scrapy,arush0311/scrapy,ArturGaspar/scrapy,shaform/scrapy,wujuguang/scrapy,rootAvish/scrapy,eLRuLL/scrapy,YeelerG/scrapy,scrapy/scrapy,redapple/scrapy,finfish/scrapy,starrify/scrapy,dangra/scrapy,eLRuLL/scrapy,ArturGaspar/scrapy,w495/scrapy,Parlin-Galanodel/scrapy,jc0n/scrapy,rolando-contrib/scrapy,pablohoffman/scrapy,GregoryVigoTorres/scrapy,rolando-contrib/scrapy,dangra/scrapy,scrapy/scrapy,w495/scrapy,foromer4/scrapy,elacuesta/scrapy,pablohoffman/scrapy,umrashrf/scrapy,scrapy/scrapy,wenyu1001/scrapy,umrashrf/scrapy,rolando-contrib/scrapy,pawelmhm/scrapy,Ryezhang/scrapy,ssteo/scrapy,jc0n/scrapy,shaform/scrapy,pablohoffman/scrapy,shaform/scrapy,kmike/scrapy,elacuesta/scrapy,ssteo/scrapy,GregoryVigoTorres/scrapy,arush0311/scrapy,rootAvish/scrapy,redapple/scrapy,YeelerG/scrapy