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| Header | Explanation | Example |
|---|---|---|
| Accept | Specifies the content types that the client can accept | Accept: text/plain, text/html |
| Accept-Charset | Character sets that the browser can accept | Accept-Charset: iso-8859-5 |
| Accept-Encoding | Specifies the compression methods supported by the browser for web server responses. | Accept-Encoding: compress, gzip |
| Accept-Language | Languages accepted by the browser. | Accept-Language: en,zh |
| Accept-Ranges | One or more sub-range fields that can request entity ranges of a web page. | Accept-Ranges: bytes |
| Authorization | Authorization credentials for HTTP authorization. | Authorization: Authorization credentials |
| Cache-Control | Specifies the caching mechanism that both request and response must follow. | Cache-Control: no-cache |
| Connection | Indicates whether a persistent connection is required. (HTTP 1.1 defaults to persistent connection) | Connection: close |
| Cookie | When an HTTP request is sent, all cookie values stored under the request domain are sent to the web server. | Cookie: $Version=1; Skin=new; |
| Content-Length | Length of the request content. | Content-Length: 348 |
| Content-Type | MIME information corresponding to the entity in the request. | Content-Type: application/x-www-form-urlencoded |
| Date | Date and time when the request was sent. | Date: Tue, 15 Nov 2020 08:12:31 GMT |
| Expect | Specific server behavior requested by the client. | Expect: 100-continue |
| From | Email address of the user making the request. | From: [email protected] |
| Host | Specifies the domain name and port number of the server to which the request is being sent. | Host: www.1024xk.com |
| If-Match | Only makes the request method effective if the contents match the entity. | If-Match: "specific value" |
| If-Modified-Since | If the requested part has been modified after the specified time, the request succeeds; otherwise, returns a 304 code. | If-Modified-Since: Sat, 29 Oct 2010 19:43:31 GMT |
| If-None-Match | Returns a 304 code if the content has not changed. Compares the Etag sent previously by the server with the Etag in the server's response to determine changes. | If-None-Match: "specific value" |
| If-Range | If the entity has not changed, the server sends the client the missing part; otherwise, it sends the entire entity. The parameter is also an Etag. | If-Range: "specific value" |
| If-Unmodified-Since | Only requests succeed if the entity has not been modified after the specified time. | If-Unmodified-Since: Sat, 29 Oct 2010 19:43:31 GMT |
| Max-Forwards | Limits the time information can be forwarded through proxies and gateways. | Max-Forwards: 10 |
| Pragma | Used to include implementation-specific directives. | Pragma: no-cache |
| Proxy-Authorization | Authorization credentials for connecting to a proxy. | Proxy-Authorization: credentials for connecting to a proxy |
| Range | Requests only a part of the entity, specified by the range. | Range: bytes=500-999 |
| Referer | Refers to the address of the previous web page from which the current request is made (i.e., the referrer). | Referer: http://www.1024xk.com |
| TE | Specifies the transfer encodings that the client is willing to accept and notifies the server of the transfer encodings it is willing to accept for response tailoring. | TE: trailers,deflate;q=0.5 |
| Upgrade | Requests that the server switch protocols (if supported) to one specified in the Upgrade header. | Upgrade: HTTP/2.0, SHTTP/1.3, IRC/6.9, RTA/x11 |
| User-Agent | Contains information about the user agent that sent the request. | User-Agent: Mozilla/5.0 (Linux; X11) |
| Via | Informs the server of the intermediaries through which the request was sent, including communication protocols and addresses. | Via: 1.0 fred, 1.1 nowhere.com (Apache/1.1) |
| Warning | Provides additional information about the status or transformation of a message. | Warn: 199 Miscellaneous warning |
| Header | Explanation | Example |
|---|---|---|
| Accept-Ranges | Indicates whether the server supports range requests and which types of range requests are supported. | Accept-Ranges: bytes |
| Age | The age of the response since it was generated or validated at the origin server (in seconds, non-negative). | Age: 12 |
| Allow | Specifies the methods allowed for a resource, otherwise returns a 405 Method Not Allowed. | Allow: GET, HEAD |
| Cache-Control | Specifies directives for caching mechanisms in both requests and responses. | Cache-Control: no-cache |
| Content-Encoding | Specifies the encoding formats the server supports for the response body. | Content-Encoding: gzip |
| Content-Language | Specifies the natural languages of the intended audience for the response body. | Content-Language: en,zh |
| Content-Length | The length of the response body in octets (8-bit bytes). | Content-Length: 348 |
| Content-Location | An alternate location for the returned resource. | Content-Location: /index.htm |
| Content-MD5 | The MD5 digest of the entity-body for the purpose of providing an end-to-end message integrity check. | Content-MD5: MD5 checksum |
| Content-Range | Indicates the byte range within the full entity-body sent in the message. | Content-Range: bytes 21010-47021/47022 |
| Content-Type | The media type of the body of the request or response. | Content-Type: text/html; charset=utf-8 |
| Date | The date and time at which the message was originated at the server. | Date: Tue, 15 Nov 2010 08:12:31 GMT |
| ETag | An identifier for a specific version of a resource, often a hash of the resource. | ETag: "entity-tag-value" |
| Expires | The date and time after which the response is considered stale. | Expires: Thu, 01 Dec 2010 16:00:00 GMT |
| Last-Modified | The last modification date of the resource being returned. | Last-Modified: Tue, 15 Nov 2010 12:45:26 GMT |
| Location | Used in redirection, or when a new resource has been created. It indicates the URL to redirect the recipient to. | Location: https://www.1024xk.com |
| Pragma | Includes implementation-specific directives that might apply to any recipient along the request/response chain. | Pragma: no-cache |
| Proxy-Authenticate | Authenticates the user to a proxy server, indicating the authentication scheme and parameters applicable to the proxy for the requested URL. | Proxy-Authenticate: Basic |
| refresh | Specifies a time in seconds for the browser to wait before refreshing or redirecting the page. |
Refresh: 5; url= https://www.1024xk.com
|
| Retry-After | If the entity is temporarily unavailable, it informs the client when to retry the request. | Retry-After: 120 |
| Server | The name of the web server software. | Server: Apache/1.3.27 (Unix) (Red-Hat/Linux) |
| Set-Cookie | Sets an HTTP cookie. | Set-Cookie: UserID=JohnDoe; Max-Age=3600; Version=1 |
| Trailer | Indicates that the indicated header field is present in the trailer of a chunked transfer encoding. | Trailer: Max-Forwards |
| Transfer-Encoding | Specifies the form of encoding used to safely transfer the entity to the user. | Transfer-Encoding: chunked |
| Vary | Informs downstream proxies how to match future request headers to decide whether to serve the requested resource from the cache or request it 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 | Warns of possible issues with the entity body. | Warning: 199 Miscellaneous warning |
| WWW-Authenticate | Indicates which authentication schemes should be used to access the requested entity. | WWW-Authenticate: Basic |
Our Online HTTP Headers Tool provides comprehensive information about HTTP headers used in requests and responses. HTTP headers are vital for conveying metadata between clients and servers, facilitating efficient communication over the web.
Using our Online HTTP Headers Tool is straightforward:
Key features of our Online HTTP Headers Tool include:
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