Responses
| Field name | Description | Example |
|---|---|---|
| Access-Control-Allow-Origin | Specifying which web sites can participate in cross-origin resource sharing | Access-Control-Allow-Origin: * |
| 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. It is measured in seconds | Cache-Control: max-age=3600 |
| Connection | Options that are desired for the connection | Connection: close |
| Content-Encoding | The type of encoding used on the data. See HTTP compression. | 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-MD5 | A Base64-encoded binary MD5 sum of the content of the response | Content-MD5: Q2hlY2sgSW50ZWdyaXR5IQ== |
| Content-Disposition | An opportunity to raise a "File Download" dialogue box for a known MIME type with binary format or suggest a filename for dynamic content. Quotes are necessary with special characters. | Content-Disposition: attachment; filename="fname.ext" |
| 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 | 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 |
| Link | Used to express a typed relationship with another resource, where the relation type is defined by RFC 5988 | Link: ; rel="alternate" |
| Location | Used in redirection, or when a new resource has been created. | Location: http://www.w3.org/pub/WWW/People.html |
| P3P | This header is supposed to set P3P policy, in the form of P3P:CP="your_compact_policy". However, P3P did not take off, most browsers have never fully implemented it, a lot of websites set this header with fake policy text, that was enough to fool browsers the existence of P3P policy and grant permissions for third party cookies. |
P3P: CP="This is not a P3P policy! See http://www.google.com/support/accounts/bin/answer.py?hl=en&answer=151657 for more info." |
| 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 (seconds). | Retry-After: 120 |
| Server | A name for the server | Server: Apache/2.4.1 (Unix) |
| Set-Cookie | an HTTP cookie | Set-Cookie: UserID=JohnDoe; Max-Age=3600; Version=1 |
| Strict-Transport-Security | A HSTS Policy informing the HTTP client how long to cache the HTTPS only policy and whether this applies to subdomains. | Strict-Transport-Security: max-age=16070400; includeSubDomains |
| 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 example.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 |
Read more about this topic: List Of HTTP Header Fields
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—Alice Sterling Honig (20th century)
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—Susan Sontag (b. 1933)