http header

http/1.0은 get만 보내도 됨

http/1.1은 host 필요

[링크 : http://serverfault.com/.../what-is-the-mandatory-information-a-http-request-header-must-contain]

[링크 : http://stackoverflow.com/questions/4726515/what-http-response-headers-are-required]

[링크 : http://stackoverflow.com/questions/6686261/what-at-the-bare-minimum-is-required-for-an-http-request]