TRACE

The TRACE method is used to perform a message loop-back test along the path to the target resource. It allows the client to see what is being received at the other end of the request chain and can be useful for debugging purposes.

Basic Syntax

TRACE /path/to/resource HTTP/1.1
Host: example.com

Key Characteristics

Safe: TRACE requests do not alter the state of the server.
Idempotent: Multiple identical TRACE requests should have the same effect as a single request.
Not Cacheable: Responses to TRACE requests are not typically cached.

Parameters

Headers: TRACE requests can include headers to specify metadata.
Max-Forwards: 5

Examples

Basic TRACE Request
TRACE /users HTTP/1.1 Host: example.com
This request performs a loop-back test for the /users resource.
TRACE Request with Max-Forwards Header
TRACE /users HTTP/1.1 Host: example.com Max-Forwards: 5
This request performs a loop-back test for the /users resource with a Max-Forwards header set to 5, limiting the number of hops the request can take.

Conclusion

The TRACE method is essential for debugging and diagnostic purposes, allowing clients to see the request path and what is being received at the server. Understanding its characteristics and how to use headers allows you to effectively troubleshoot and interact with web APIs.

Last modified: 05 December 2024