HTTP Proxy Explained: How It Works and What to Look For
An HTTP forward proxy acts as an intermediary for a client’s requests.
Published by Protocol Explorer · Reviewed
How HTTP Proxy works
For ordinary forwarding, the proxy receives a request and communicates with an upstream server. CONNECT can establish a tunnel to a target host and port.
What to look for in an exchange
A successful CONNECT response establishes a tunnel; subsequent TLS, when used, is negotiated through it. Proxy configuration and trust determine what the intermediary can observe.
Follow an example step by step
- Identify the client request sent to the configured forward proxy.
- For CONNECT, read the requested destination host and port and the proxy response.
- If a tunnel is established, follow any subsequent TLS handshake inside that connection.
Common interpretation mistake
A CONNECT tunnel is not equivalent to the proxy decrypting the enclosed HTTPS traffic.
Key point to remember
Whether a proxy can inspect content depends on the deployment and trust arrangement.
Explore the protocol
The HTTP Proxy overview is free without an account. Its full interactive lesson is included in Protocol Explorer Pro, a one-time $4.99 purchase; an account is required to buy Pro and restore the licence across devices.
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Specification
Read the primary specification for HTTP Proxy for the authoritative protocol details. The interactive scenario is a simplified teaching model, not a capture of your network.
Continue learning
How to read a packet · TCP · UDP · HTTPS