Created On: 2016-12-22
Curl has the best proxy support among many HTTP clients and downloadtools. This is how you use a socks5 proxy and also resolve hostname in the URLusing the socks5 proxy. For some use case, resolving hostname via the proxy isessential.
I assume curl is reading the proxy address from the environment variable httpproxy and that the variable should keep its value. Then in a shell like bash, export httpproxy='; before a command (or in a shell script) would temporarily change its value. (See curl's manual for all the variables it looks at, under the ENVIRONMENT heading.).
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- Proxy resolves URL hostname. Without a scheme prefix, CURLOPTPROXYTYPE can be used to specify which kind of proxy the string identifies. When you tell the library to use an HTTP proxy, libcurl will transparently convert operations to HTTP even if you specify an FTP URL etc.
- If you use an SSPI-enabled curl binary and do NTLM authentication, you can force curl to pick up the username and password from your environment by specifying a single colon with this option: '-u:'. If this option is used several times, the last one will be used.
Suppose you have a socks5 proxy running on localhost:8001.
In curl >= 7.21.7, you can use
In curl >= 7.18.0, you can use
Many tools use libcurl internally or use curl command in their installerscript. Download sdk java for mac. If it's difficult to modify the command line itself, you can set proxyusing environment variables.
If you want to overwrite system proxy settings, you may also need to set twomore variables:
Note that http_proxy is lower case, the other two is upper case.
Test TCP connectivity with curl
You probably know about curl command: it’s great for downloading web pages or files from a Unix command line. But there’s another great usage curl command has: testing TCP ports connectivity.
Say, you’re helping with some firewall changes and need to confirm that connection from your server to some remote host and specific TCP port still works.
Here’s how you can do it using curl command and its telnet functionality.
Test SSH port connection with curl
In this example, SSH connection works because:
- We get the “Connected” status
- We see the SSH version prompt: SSH-2.0-OpenSSH_7.4
Test jBoss port 8080 with curl
This scenario shows that connection is refused (probably because there’s no service running on that port).
IMPORTANT: you would probably get a different message if firewall blocks the 8080 port. Connection refused is a clear sign that port is accessible, but nothing’s responding on it.
See Also
Curl Use Proxy Https
- Using wget and curl
- iptables: keep rules after reboot
Curl Use Proxy Example