The header field is used to provide the browser and server with the message body size, language used, authentication information, etc.
4 Types of header fields
Generic header Field
Request Header Field
Response Header Field
Entity header Field
Detailed Description:
HTTP header field type
- Generic header field: The header that both the request and response messages will use
| header Field Name | description |
|---|---|
| cache-control| Control Caching Behavior |
| connection| Hop Header, Connection management |
| date| Date and time the message was created |
| pragma| Message Instruction |
| trailer| header at the end of the message list |
| Transfer-encoding| specifying the transmission encoding of the message body |
| Upgrade| upgrade to other protocols |
| Information about the via| Proxy Server |
| Warning| Error Notification |
- Request Header Field
| header Field Name | description |
|---|---|
| Accept| media types that the user agent can handle |
| Accept-charset| Preferred Character Set |
| Accept-encoding| Priority Content Coding |
| Accept-language| Preferred Language |
| authorization| Web Certification Information |
| Expect| expecting server specific behavior |
| e-mail address for from| users |
| Host| the server where the resource is requested |
| if-match| Compare Entity tags ( ETag ) |
| if-modified-since| update time for comparison resources |
| If-none-match| Comparing Entity tags (with If-Match opposite) |
| Send entity's range request when if-range| resource is not updated Byte |
| if-unmodified-since| update time for compare resources (with If-Modified-Since opposite) |
| max-forwards| Maximum Transmission Hop-by-jump |
| proxy-authorization| Proxy Server requires authentication information for clients |
| Byte range request for range| entity |
| referer| to URI the original acquiring party in the request |
|te| priority of transmission encoding |
| User-agent| priority of transmission encoding |
- Response Header Field
| header Field Name | description |
|---|---|
| Whether the accept-ranges| accepts byte range requests |
| Age| Estimating Resource creation Elapsed Time |
| Matching information for etag| resources |
| location| REDIRECT client to specified URI |
| Proxy-authenticate| Proxy Server Authentication information for clients |
| retry-after| time requirement for re-launch request |
| server| Installation information for HTTP Server |
| vary| Management information for proxy Server caching |
| www-authenticate| server-to-Client authentication information |
- Entity header field: Header used for the entity portion of the request message and response message
| header Field Name | description |
|---|---|
| HTTP methods supported by the allow| resource |
| Content-encoding| the code used by the entity body |
| Content-language| natural Language for entity bodies |
| content-length| the size of the entity body (units: bytes) |
| content-location| substitution of corresponding resources URI |
| content-md5| Abstract of Entity body |
| content-range| the position range of the entity body |
| content-type| the media type of the entity body |
| expires| entity principal expires Date Time |
| last-modified| Resource Last Modified date Time |
The header field for the Cookie service
Cookiethe header field for the service
| header Field Name | description |
|---|---|
| set-cookie| Start state Management usage Cookie Information |
| Information received by the cookie| server Cookie |Set-CookieProperties of the field
| header Field Name | description |
|---|---|
|name=value| assigned Cookie name and its value (required) |
|expires=date| Cookie Expiration date (default is until the browser is closed if not explicitly specified) |
|path=path| the file directory on the server as Cookie the applicable object (default is the file directory where the document is located if not specified) |
|domain= Domain name | As the Cookie domain name of the applicable object (default is the domain name of the server created if not specified Cookie ) |
| Secure| is only HTTPS sent when secure communication Cookie |
| Httponly| is restricted so that it Cookie cannot be JavaScript accessed by script |
HTTP Learning (ii)
