cURL Configuration for the Proxy

This article addresses configuration of cURL and libcurl for the proxy. cURL (Client URL Library) is used in command lines or scripts to transfer data with URLs. The current version is 7.65.0 (May 2019). libcurl is a client-side URL transfer library.

cURL supports HTTP and HTTPS, among other protocols. The libcurl library provides a cross-platform C library with bindings for many languages and frameworks commonly used in proxy operations, including Java, .NET, NodeJS, PHP, and Python. Some scripting languages, such as PHP, also include the cURL library.

Information and Downloads

Click the link for a summary of cURL. This site also provides links to source code: Click Download, then select “Browse Source.”.

To get cURL source code directly, click here.

To pass custom headers in from a linked list to HTTP and HTTPS requests, you can use the CURLOPT_PROXYHEADER option. Click the link for more information and a code example.

Environment Variable

If you have set the http_proxy environment variable, cURL will recognize it. On a Unix or Linux system, this might look like

export http_proxy=http://USERNAME:[email protected]:PORT
	

If the variable is not set, you can also do the following:

curl -x http://PROXYHOST:PORT -U USERNAME:PASSWORD http://example.com