HTTP Method - CONNECT

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What Is the HTTP CONNECT Method?

In web networking, communication occurs between a client (such as your browser) and a web server (the host running the website).

The HTTP CONNECT method is a specialized request used to start two-way communications with the requested resource. Specifically, it allows a client to establish an end-to-end network tunnel to a destination server through an intermediate proxy or firewall machine over HTTP.

How HTTP Tunneling Works

When your client wants to access a secure destination through a proxy server:

• The client sends an HTTP CONNECT request specifying the host and port of the desired destination.
• The proxy server sets up a direct TCP connection to that target on the client's behalf.
• Once established, the proxy simply blind-relays data back and forth, enabling encrypted SSL/TLS (HTTPS) traffic without intercepting the content.

Sample HTTP CONNECT Request & Response

Here is an example showing the structure of an HTTP CONNECT request:

CONNECT www.ramnjava.blogspot.com:443 HTTP/1.1
Host: www.ramnjava.blogspot.com:443
User-Agent: Mozilla/5.0

When the proxy or gateway server successfully connects to the remote host, it returns a response with the status code 200 Connection established:

HTTP/1.1 200 Connection established
Proxy-Agent: Apache/2.2.14

After this status response is received, the tunnel is active, and direct data exchange begins immediately between the client and server.

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HTTP Method - CONNECT

HTTP Method - CONNECT

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