impl ppb_url_request_info_append_data_to_body
store in url_pair_list copies of url
rename field in url_loader
rename freeing helper macro
set sane default values in url_loader create function
reflow field initialization in url_loader_open
cleanup url_loader_open/follow_redirect
cleanup code in NPP_NewStream redirection handling
rename aux callback parameter structure in ppb_url_loader.c
add support for POST requests
trim trailing newlines in client supplied headers in ppb_url_loader_open