Appendix B. HTTP Headers
| Header | Description | Reference |
| Gives instructions to caching mechanisms that the request/response passes through related to its cachability. | http://tools.ietf.org/html/draft-ietf-httpbis-p6-cache-21#section-7.2 |
| Gives options that are specific to the current connection and should not be passed on to proxies. | http://tools.ietf.org/html/draft-ietf-httpbis-p1-messaging-21#section-6.1 |
| Specifies the date and time the message originated. | http://tools.ietf.org/html/draft-ietf-httpbis-p2-semantics-21#section-8.1.1.2 |
| Specifies to caches that they should always revalidate a response they have cached. It exists for backward compatibility with HTTP 1.0 clients and is deprecated in HTTP 1.1 by the | http://tools.ietf.org/html/draft-ietf-httpbis-p6-cache-21#section-7.4 |
| Indicates if the message body has had any transformation applied to it in order to transfer it between the sender and the recepient. | http://tools.ietf.org/html/draft-ietf-httpbis-p1-messaging-21#section-3.3.1 |
| Allows the client to specify that it would like to use additional protocols if the server is willing to switch. | http://tools.ietf.org/html/draft-ietf-httpbis-p1-messaging-21#section-6.3 |
| Used by gateways and proxies, it contains the intermediate protocols and recepients between the client and the server on requests, and the server and client on responses. This header is very useful in a response from a | http://tools.ietf.org/html/draft-ietf-httpbis-p1-messaging-21#section-5.7 |
| Used to carry additional information about the message that may not be reflected in the mesage itself. | http://tools.ietf.org/html/draft-ietf-httpbis-p1-messaging-21#section-5.7 |
| Header | Description | Reference |
| Provides the host and port information in the target URI. | http://tools.ietf.org/html/draft-ietf-httpbis-p1-messaging-21#section-5.4 |
| For use with debugging with | http://tools.ietf.org/html/draft-ietf-httpbis-p2-semantics-21#section-6.1.1 |
| Tells the server expected behavior from the client. For example, | http://tools.ietf.org/html/draft-ietf-httpbis-p2-semantics-21#section-6.1.2 |
| Specifies that the server should perform a byte-range operation and return only the requested bytes. | http://tools.ietf.org/html/draft-ietf-httpbis-p5-range-21#section-5.4 |
| Used to make a conditional request that should be performed only if the value of the entity tag matches one or more representations of the resource | http://tools.ietf.org/html/draft-ietf-httpbis-p4-conditional-21#section-3.1 |
| Used to make a conditional request that should be performed only if the value of the entity tag does not match one or more representations of the resource. | http://tools.ietf.org/html/draft-ietf-httpbis-p4-conditional-21#section-3.2 |
| Used to make a conditional request that should be performed only if the resource has been modified since the specified date. | http://tools.ietf.org/html/draft-ietf-httpbis-p4-conditional-21#section-3.3 |
| Used to make a conditional request that should be performed only if the resource has not been modified since the specified date. | http://tools.ietf.org/html/draft-ietf-httpbis-p4-conditional-21#section-3.4 |
| Used to make a conditional request that allows a client to get a partial representation returned as long as the entity tag matches. | http://tools.ietf.org/html/draft-ietf-httpbis-p4-conditional-21#section-3.5 |
| Contains a prioritized list of acceptable response media types for the response. | http://tools.ietf.org/html/draft-ietf-httpbis-p2-semantics-21#section-6.3.2 |
| Contains a prioritized list of acceptable character encodings for the response. | http://tools.ietf.org/html/draft-ietf-httpbis-p2-semantics-21#section-6.3.3 |
| Contains a prioritized list of acceptable transfer codings. | http://tools.ietf.org/html/draft-ietf-httpbis-p2-semantics-21#section-6.3.4 |
| Contains a prioritized list of languages. | http://tools.ietf.org/html/draft-ietf-httpbis-p2-semantics-21#section-6.3.5 |
| Specifies the email for the human who is making the request. | http://tools.ietf.org/html/draft-ietf-httpbis-p2-semantics-21#section-6.5.1 |
| Specifies the URI for the resource that provided the target URI for the current request. | http://tools.ietf.org/html/draft-ietf-httpbis-p2-semantics-21#section-6.5.2 |
| Indicates acceptable transfer codings, besides “chunked.” | http://tools.ietf.org/html/draft-ietf-httpbis-p1-messaging-21#section-4.3 |
| Specifies information about the client generating the request. | http://tools.ietf.org/html/draft-ietf-httpbis-p2-semantics-21#section-6.5.3 |
| Contains credentials for the realm being accessed. | http://tools.ietf.org/html/draft-ietf-httpbis-p7-auth-21#section-4.1 |
| Header | Description | Reference |
| Specifies how much time has elapsed since the response was generated. | http://tools.ietf.org/html/draft-ietf-httpbis-p6-cache-21#section-7.1 |
| Specifies the date and time when the message was generated. | http://tools.ietf.org/html/draft-ietf-httpbis-p2-semantics-21#section-8.1.1.2 |
| Specifies a resource that is associated with the response (either a resource that was created or one that the client should redirect to). | http://tools.ietf.org/html/draft-ietf-httpbis-p2-semantics-21#section-8.1.1.2 |
| Indicates how long the client should wait before retrying a request to the resource. In the case of a redirect, it relates to the redirect URI. | http://tools.ietf.org/html/draft-ietf-httpbis-p2-semantics-21#section-8.1.1.3 |
| Specifies the date and time at which the origin server believes the representation was modified. | http://tools.ietf.org/html/draft-ietf-httpbis-p4-conditional-21#section-2.2 |
| Specifies an identifier that is unique to the currently selected representation. | http://tools.ietf.org/html/draft-ietf-httpbis-p4-conditional-21#section-2.3 |
| Indicates which header fields were used as part of selecting the representation returned to the client. | http://tools.ietf.org/html/draft-ietf-httpbis-p2-semantics-21#section-8.2.1 |
| Indicates one or more authentication challenges informing the client how they must authenticate to the target resource. | http://tools.ietf.org/html/draft-ietf-httpbis-p7-auth-21#section-4.4 |
| Specifies one or more authentication challenges informing the client how they must authenticate to the proxy for the target resource. | http://tools.ietf.org/html/draft-ietf-httpbis-p7-auth-21#section-4.2 |
| Specifies the acceptable ranges clients may use with a range request. | http://tools.ietf.org/html/draft-ietf-httpbis-p5-range-21#section-5.1 |
| Specifies which HTTP methods are acceptable to the target resource. | http://tools.ietf.org/html/draft-ietf-httpbis-p2-semantics-21#section-8.4.1 |
| Contains information about the server environment for the origin server. | http://tools.ietf.org/html/draft-ietf-httpbis-p2-semantics-21#section-8.4.2 |
| Header | Description | Reference |
| Specifies the media type of the representation. | http://tools.ietf.org/html/draft-ietf-httpbis-p2-semantics-21#section-3.1.1.5 |
| Specifies the content codings that have been applied to the representation. | http://tools.ietf.org/html/draft-ietf-httpbis-p2-semantics-21#section-3.1.2.2 |
| Indicates the language for the intended audience of the current representation. | http://tools.ietf.org/html/draft-ietf-httpbis-p2-semantics-21#section-3.1.1.5 |
| Specifies a URI for specifically retrieving the current representation. | http://tools.ietf.org/html/draft-ietf-httpbis-p2-semantics-21#section-3.1.4.2 |
| Gives the date and time for when the response is considered stale. | http://tools.ietf.org/html/draft-ietf-httpbis-p6-cache-21#section-7.3 |
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