How Can I Inspect an HTTP Request Body Without Modifying It?

Inspecting HTTP Request Body without Altering It

In a scenario where you need to analyze an incoming POST request's body without altering its state, the issue arises with the depletion of the request stream, resulting in errors when forwarding to a reverse proxy.

To address this, consider the following approach:

Create a buffer by reading into it from the original request body (io.ReadAll(r.Body)).

Use the buffer to create two new readers:

• rdr1 for your analysis using built-in parsing functions like req.ParseForm().
• rdr2 for subsequent consumers to ensure the original request state remains intact.

Assign rdr2 to r.Body, enabling subsequent handlers to operate on the unmodified request.

This technique allows you to inspect the request body without affecting the original request object, ensuring its integrity for further processing.

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