Request
|
Header |
Description |
Example |
|---|---|---|
| Accept | Content-Types that are acceptable | Accept: text/plain |
| Accept-Charset | Character sets that are acceptable | Accept-Charset: iso-8859-5 |
| Accept-Encoding | Acceptable encodings | Accept-Encoding: compress, gzip |
| Accept-Language | Acceptable languages for response | Accept-Language: da |
| Accept-Ranges | Allows the server to indicate its acceptance of range requests for a resource | Accept-Ranges: bytes |
| Authorization | Authentication credentials for HTTP authentication | Authorization: Basic QWxhZGRpbjpvcGVuIHNlc2FtZQ== |
| Cache-Control | Used to specify directives that MUST be obeyed by all caching mechanisms along the request/response chain | Cache-Control: no-cache |
| Connection | What type of connection the user-agent would prefer | Connection: close |
| Cookie | an HTTP cookie previously sent by the server with Set-Cookie (below) | Cookie: $Version=1; Skin=new; |
| Content-Length | The length of the request body in octets (8-bit bytes) | Content-Length: 348 |
| Content-Type | The mime type of the body of the request (used with POST and PUT requests) | Content-Type: application/x-www-form-urlencoded |
| Date | The date and time that the message was sent | Date: Tue, 15 Nov 1994 08:12:31 GMT |
| Expect | Indicates that particular server behaviors are required by the client | Expect: 100-continue |
| From | The email address of the user making the request | From: user@email.com |
| Host | The domain name of the server (for virtual hosting), mandatory since HTTP/1.1 | Host: en.wikipedia.org |
| If-Match | Only perform the action if the client supplied entity matches the same entity on the server. This is mainly for methods like PUT to only update a resource if it has not been modified since the user last updated it. | If-Match: "737060cd8c284d8af7ad3082f209582d" |
| If-Modified-Since | Allows a 304 Not Modified to be returned if content is unchanged | If-Modified-Since: Sat, 29 Oct 1994 19:43:31 GMT |
| If-None-Match | Allows a 304 Not Modified to be returned if content is unchanged, see HTTP ETag | If-None-Match: "737060cd8c284d8af7ad3082f209582d" |
| If-Range | If the entity is unchanged, send me the part(s) that I am missing; otherwise, send me the entire new entity | If-Range: "737060cd8c284d8af7ad3082f209582d" |
| If-Unmodified-Since | Only send the response if the entity has not been modified since a specific time. | If-Unmodified-Since: Sat, 29 Oct 1994 19:43:31 GMT |
| Max-Forwards | Limit the number of times the message can be forwarded through proxies or gateways. | Max-Forwards: 10 |
| Pragma | Implementation-specific headers that may have various effects anywhere along the request-response chain. | Pragma: no-cache |
| Proxy-Authorization | Authorization credentials for connecting to a proxy. | Proxy-Authorization: Basic QWxhZGRpbjpvcGVuIHNlc2FtZQ== |
| Range | Request only part of an entity. | Range: bytes=500-999 |
| Referer | This is the address of the previous web page from which a link to the currently requested page was followed. | Referer: http://en.wikipedia.org/wiki/Main_Page |
| TE | The transfer encodings the user agent is willing to accept: the same values as for the response header Transfer-Encoding can be used, plus the "trailers" value (related to the "chunked" transfer method) to notify the server it accepts to receive additional headers (the trailers) after the last, zero-sized, chunk. | TE: trailers, deflate;q=0.5 |
| Upgrade | Ask the server to upgrade to another protocol. | Upgrade: HTTP/2.0, SHTTP/1.3, IRC/6.9, RTA/x11 |
| User-Agent | The user agent string of the user agent | User-Agent: Mozilla/5.0 (Linux; X11) |
| Via | Informs the server of proxies through which the request was sent. | Via: 1.0 fred, 1.1 nowhere.com (Apache/1.1) |
| Warn | A general warning about possible problems with the entity body. | Warn: 199 Miscellaneous warning |
Response
|
Header |
Description |
Example |
|---|---|---|
| Accept-Ranges | What partial content range types this server supports | Accept-Ranges: bytes |
| Age | The age the object has been in a proxy cache in seconds | Age: 12 |
| Allow | Valid actions for a specified resource. To be used for a 405 Method not allowed | Allow: GET, HEAD |
| Cache-Control | Tells all caching mechanisms from server to client whether they may cache this object | Cache-Control: no-cache |
| Content-Encoding | The type of encoding used on the data | Content-Encoding: gzip |
| Content-Language | The language the content is in | Content-Language: da |
| Content-Length | The length of the response body in octets (8-bit bytes) | Content-Length: 348 |
| Content-Location | An alternate location for the returned data | Content-Location: /index.htm |
| Content-Disposition | An opportunity to raise a "File Download" dialogue box for a known MIME type | Content-Disposition: attachment; filename=fname.ext |
| Content-MD5 | A Base64-encoded binary MD5 sum of the content of the response | Content-MD5: Q2hlY2sgSW50ZWdyaXR5IQ== |
| Content-Range | Where in a full body message this partial message belongs | Content-Range: bytes 21010-47021/47022 |
| Content-Type | The mime type of this content | Content-Type: text/html; charset=utf-8 |
| Date | The date and time that the message was sent | Date: Tue, 15 Nov 1994 08:12:31 GMT |
| ETag | An identifier for a specific version of a resource, often a Message Digest, see ETag | ETag: "737060cd8c284d8af7ad3082f209582d" |
| Expires | Gives the date/time after which the response is considered stale | Expires: Thu, 01 Dec 1994 16:00:00 GMT |
| Last-Modified | The last modified date for the requested object, in RFC 2822 format | Last-Modified: Tue, 15 Nov 1994 12:45:26 GMT |
| Location | Used in redirection, or when a new resource has been created. | Location: http://www.w3.org/pub/WWW/People.html |
| Pragma | Implementation-specific headers that may have various effects anywhere along the request-response chain. | Pragma: no-cache |
| Proxy-Authenticate | Request authentication to access the proxy. | Proxy-Authenticate: Basic |
| Refresh | Used in redirection, or when a new resource has been created. This refresh redirects after 5 seconds. (This is a proprietary/non-standard header extension introduced by Netscape and supported by most web browsers.) |
Refresh: 5; url=http://www.w3.org/pub/WWW/People.html |
| Retry-After | If an entity is temporarily unavailable, this instructs the client to try again after a specified period of time. | Retry-After: 120 |
| Server | A name for the server | Server: Apache/1.3.27 (Unix) (Red-Hat/Linux) |
| Set-Cookie | an HTTP cookie | Set-Cookie: UserID=JohnDoe; Max-Age=3600; Version=1 |
| Trailer | The Trailer general field value indicates that the given set of header fields is present in the trailer of a message encoded with chunked transfer-coding. | Trailer: Max-Forwards |
| Transfer-Encoding | The form of encoding used to safely transfer the entity to the user. Currently defined methods are: chunked, compress, deflate, gzip, identity. | Transfer-Encoding: chunked |
| Vary | Tells downstream proxies how to match future request headers to decide whether the cached response can be used rather than requesting a fresh one from the origin server. | Vary: * |
| Via | Informs the client of proxies through which the response was sent. | Via: 1.0 fred, 1.1 nowhere.com (Apache/1.1) |
| Warning | A general warning about possible problems with the entity body. | Warning: 199 Miscellaneous warning |
| WWW-Authenticate | Indicates the authentication scheme that should be used to access the requested entity. | WWW-Authenticate: Basic |
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