Building a Simple HTTP Proxy Server in C#: A Step-by-Step Guide
Overview
This guide provides a foundational understanding of creating a basic HTTP proxy server in C#. An HTTP proxy acts as an intermediary between a client (like a web browser) and a web server, handling requests and responses.
Context
HTTP proxies receive client requests, forward them to the target web server, receive the server's response, and then relay that response back to the client. The browser is configured to send all its traffic through the proxy.
Implementation Details
Building a simple C# HTTP proxy involves these key steps:
- Establish Client Connections: Begin by opening a TCP port to listen for incoming connections from clients.
- Process Client Requests: Receive and parse the HTTP request headers from the client to understand the requested resource and target server.
- Connect to the Target Server: Extract the server address from the parsed request and establish a TCP connection to that server.
- Data Transfer: Forward the client's request to the server and then relay the server's response back to the client, managing the bidirectional data flow.
- Advanced Features (Optional): Enhance your proxy with features like custom header manipulation or content filtering.
Summary
Following these steps allows you to build a working HTTP proxy server in C#. This foundation can then be expanded upon to create more sophisticated proxies with advanced functionalities.
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