add default MaxHeaderBytes (0) as in stl
add default MaxHeaderBytes (0) as in stl

fzerorubigd/endless,fvbock/endless,currantlabs/endless,fvbock/endless,henrylee2cn/endless,imcom/endless,currantlabs/endless,fzerorubigd/endless,imcom/endless,henrylee2cn/endless,flier/endless,larsth/endless,flier/endless