| Long: header |
| Short: H |
| Arg: <header/@file> |
| Help: Pass custom header(s) to server |
| Protocols: HTTP |
| --- |
| Extra header to include in the request when sending HTTP to a server. You may |
| specify any number of extra headers. Note that if you should add a custom |
| header that has the same name as one of the internal ones curl would use, your |
| externally set header will be used instead of the internal one. This allows |
| you to make even trickier stuff than curl would normally do. You should not |
| replace internally set headers without knowing perfectly well what you're |
| doing. Remove an internal header by giving a replacement without content on |
| the right side of the colon, as in: -H \&"Host:". If you send the custom |
| header with no-value then its header must be terminated with a semicolon, such |
| as \-H \&"X-Custom-Header;" to send "X-Custom-Header:". |
| |
| curl will make sure that each header you add/replace is sent with the proper |
| end-of-line marker, you should thus \fBnot\fP add that as a part of the header |
| content: do not add newlines or carriage returns, they will only mess things up |
| for you. |
| |
| Starting in 7.55.0, this option can take an argument in @filename style, which |
| then adds a header for each line in the input file. Using @- will make curl |
| read the header file from stdin. |
| |
| See also the --user-agent and --referer options. |
| |
| Starting in 7.37.0, you need --proxy-header to send custom headers intended |
| for a proxy. |
| |
| Example: |
| |
| curl -H "X-First-Name: Joe" http://example.com/ |
| |
| \fBWARNING\fP: headers set with this option will be set in all requests - even |
| after redirects are followed, like when told with --location. This can lead to |
| the header being sent to other hosts than the original host, so sensitive |
| headers should be used with caution combined with following redirects. |
| |
| This option can be used multiple times to add/replace/remove multiple headers. |
