When libcurl issues HTTP requests as part of performing the data transfers you have asked it to, it sends them off with a set of HTTP headers that are suitable for fulfilling the task given to it.

An HTTP request sent by a client starts with a request line, followed by headers and then optionally a body. The most common HTTP request is probably the GET request which asks …

In all user surveys and during all curl's lifetime, HTTP has been the most important and most frequently used protocol that curl supports. This chapter explains how to do effective HTTP …

curl can do almost every HTTP operation and transfer your favorite browser can. It can actually do a lot more than so as well, but in this chapter we focus on the fact that you can use curl to …

When telling curl to do something, you invoke curl with zero, one or several command-line options to accompany the URL or set of URLs you want the transfer to be about. curl supports over …

The HTTP version of the proxy environment variables is treated differently than the others. It is only accepted in its lower case version because of the CGI protocol, which lets users run …

Everything curl is an extensive guide for all things curl. The project itself, the command-line tool, the library, how everything started and how it came to be the useful tool it is today.

An HTTP response has a certain size and curl needs to figure it out. There are several different ways to signal the end of an HTTP response but the most basic way is to use the Content …

You tunnel through an HTTP proxy with curl using -p or --proxytunnel. When you do HTTPS through a proxy you normally connect through to the default HTTPS remote TCP port number …

This is usually an unrecoverable error, but trying to force curl to speak HTTP/1 instead might circumvent it. An API function was called from inside a callback.