HTTP Headers

Header Name	Description
ALPN	Specifies the protocols to initiate a CONNECT tunnel with.
Accept	Specifies which response media types are acceptable.
Accept-Charset	Indicates which character sets are acceptable in responses.
Accept-Encoding	Specifies which response content codings are acceptable.
Accept-Language	Specifies the (natural) languages preferred by the user.
Accept-Patch	Specifies which media types are acceptable to send in a PATCH request.
Accept-Ranges	Indicates that the resource supports Range requests.
Age	Indicates response was served from a cache.
Allow	Lists methods supported by the resource.
Authorization	Provides credentials authenticating the client to the origin.
Connection	Lists hop-by-hop headers that must be consumed by the downstream node.
Content-Encoding	Lists the transformations applied to the message body.
Content-Language	Indicates the (written) language of the document.
Content-Length	Specifies the size (bytes) of the attached message body.
Content-Location	Specifies a URI that the message body is available at.
Content-Range	Indicates the offset of the returned part from the entire representation.
Content-Type	Indicates the media type of the document.
Date	Specifies the date that the origin server generated the response.
ETag	Specifies an identifier for the selected representation
Expect	Lists behaviors expected from the server to properly make the request.
Expires	How long a response may be cached without revalidation.
Forwarded	Provides connection metadata from upstream nodes.
From	Supplies contact information for the requesting user.
Host	Specifies the authority component of the request-URI.
If-Match	makes filling a request conditional on the resource having one of the specified ETags
If-Modified-Since	Makes the request conditional on the resource being updated after the provided date.
If-None-Match	Makes request conditional on target resource having been changed.
If-Range	Makes the Range header conditional on the document being unmodified since the specified revision.
If-Unmodified-Since	Makes the request conditional on the resource being unchanged since the provided date.
Last-Modified	Identifies the date when the representation was last modified
Link	Attaches a link to the message.
Location	Refers to another resource, depending on status code
Max-Forwards	Limits how many intermediate nodes a message can pass through.
Prefer	Specifies client preferences for the server.
Preference-Applied	Specifies which preferences were observed, if not otherwise evident by the response.
Proxy-Authenticate	Requests the user-agent authenticate to an intermediate proxy.
Proxy-Authorization	Provides credentials authenticating the client to the proxy.
Range	Specifies a subset of the representation to return in the response, instead of the entire document.
Referer	Specifies where the request-URI was obtained from.
Retry-After	Specifies a time to wait before re-trying a request.
Server	Names the server software name and version generating the origin response.
TE	Lists transfer codings supported by the user-agent.
Trailer	Lists headers expected in the chunked encoding's trailer section.
Transfer-Encoding	Lists transfer encodings used to transmit the message body.
Upgrade	Request that the server transition to another protocol.
User-Agent	Names the user agent and version making the request.
Vary	Lists headers that affect the response.
Via	Lists upstream nodes that have processed the message.
WWW-Authenticate	Requests the user-agent authenticate to the origin.