How do I retrieve path parameters from Go HTTP requests?

Retrieving Path Parameters in Go HTTP Requests

In Go's HTTP package, path parameters allow developers to extract specific values from the request URL. This is crucial for REST API development, where each path represents a specific resource or action.

Mapping Path Parameters

To map a path parameter, use the http.HandleFunc function with a path template containing the parameter name. For example:

http.HandleFunc("/provisions/:id", Provisions)

Here, :id is the path parameter name, and it will be automatically extracted from the request path.

Retrieving Path Parameters

Within the handler function, you can retrieve the path parameter using the r.URL.Path property. To extract the parameter value, you need to split the path string accordingly. Here's how to do it:

id := strings.TrimPrefix(req.URL.Path, "/provisions/")

This line of code removes the /provisions/ prefix from the path and leaves only the id value. You can also use other methods like strings.Split or regular expressions to extract the parameter value.

By utilizing this technique, you can easily extract path parameters from HTTP requests without the need for external routing libraries. However, it's important to note that handling complex path mapping scenarios may become more challenging when using this manual approach.

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