常见的http响应头
ACCESS_CONTROL_ALLOW_ORIGIN = 'Access-Control-Allow-Origin'
ACCEPT_PATCH = 'Accept-Patch'
ACCEPT_RANGES = 'Accept-Ranges'
AGE = 'Age'
ALLOW = 'Allow'
CACHE_CONTROL = 'Cache-Control'
CONNECTION = 'Connection'
CONTENT_DISPOSITION = 'Content-Disposition'
CONTENT_ENCODING = 'Content-Encoding'
CONTENT_LANGUAGE = 'Content-Language'
CONTENT_LENGTH = 'Content-Length'
CONTENT_LOCATION = 'Content-Location'
CONTENT_MD5 = 'Content-MD5'
CONTENT_RANGE = 'Content-Range'
CONTENT_TYPE = 'Content-Type'
DATE = 'Date'
ETAG = 'ETag'
EXPIRES = 'Expires'
LAST_MODIFIED = 'Last-Modified'
LINK = 'Link'
LOCATION = 'Location'
P3P = 'P3P'
PRAGMA = 'Pragma'
PROXY_AUTHENTICATE = 'Proxy-Authenticate'
PUBLIC_KEY_PINS = 'Public-Key-Pins'
REFRESH = 'Refresh'
RETRY_AFTER = 'Retry-After'
SERVER = 'Server'
SET_COOKIE = 'Set-Cookie'
STATUS = 'Status'
TRAILER = 'Trailer'
TRANSFER_ENCODING = 'Transfer-Encoding'
UPGRADE = 'Upgrade'
VARY = 'Vary'
VIA = 'Via'
WARNING = 'Warning'
WWW_AUTHENTICATE = 'WWW-Authenticate'