- HTTP request/response data structure
http://chonnom.com/bbs/board.php?bo_table=B17&wr_id=22

- HTTP header fields
http://en.wikipedia.org/wiki/List_of_HTTP_header_fields

- HTTP status codes
http://en.wikipedia.org/wiki/List_of_HTTP_status_codes

- POST multipart data structure
http://stackoverflow.com/questions/8659808/how-does-http-file-upload-work

- Transfer-Encoding: chunked process
http://stackoverflow.com/questions/5178017/get-content-from-http-request-even-if-there-is-no-contentlength-header