extend tests for headers.replace()
extend tests for headers.replace()

Kriechi/mitmproxy,Kriechi/mitmproxy,mitmproxy/mitmproxy,mhils/mitmproxy,mitmproxy/mitmproxy,vhaupert/mitmproxy,Kriechi/mitmproxy,vhaupert/mitmproxy,mhils/mitmproxy,mhils/mitmproxy,mitmproxy/mitmproxy,mhils/mitmproxy,vhaupert/mitmproxy,mhils/mitmproxy,vhaupert/mitmproxy,Kriechi/mitmproxy,mitmproxy/mitmproxy,mitmproxy/mitmproxy