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The cURL project
Network and protocols
Install curl
Source code
Build curl
Command line basics
Using curl
Verbose
Version
Persistent connections
Downloads
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Connections
Timeouts
.netrc
Proxies
Discover your proxy
PAC
Captive portals
Proxy type
HTTP proxy
SOCKS proxy
MITM proxy
Authentication
HTTPS proxy
Proxy environment variables
Proxy headers
Exit status
SCP and SFTP
Reading email
Sending email
MQTT
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TELNET
DICT
TLS
Copy as curl
HTTP with curl
FTP with curl
Using libcurl
HTTP with libcurl
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libcurl internals
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Proxy headers
When you want to add HTTP headers meant specifically for an HTTP or HTTPS proxy, and not for the remote server, the --header option falls short.
For example, if you issue an HTTPS request through an HTTP proxy, it will be done by first issuing a CONNECT to the proxy that establishes a tunnel to the remote server and then it sends the request to that server. That first CONNECT is only issued to the proxy and you may want to make sure only that receives your special header, and send another set of custom headers to the remote server.
Set a specific different User-Agent: only to the proxy:
curl --proxy-header "User-Agent: magic/3000" -x proxy https://example.com/
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