How Do I Query POST Request Parameters Using Go's `http` Package?

Querying POST Requests with Go's http Package

When working with POST requests in Go's http package, accessing and parsing the query string can seem challenging. However, understanding the available methods will simplify the task.

The key concept to remember is that the Query method within the Request object enables you to retrieve the parameters from the request's URL. A simple example is as follows:

r := http.Request{
    URL: &url.URL{
        RawQuery: "param1=b",
    },
}

fmt.Println("GET params:", r.URL.Query())

This code will print:

map[param1:[b]]

You can retrieve individual parameters using the Get method:

param1 := r.URL.Query().Get("param1")

Alternatively, you can obtain a slice containing multiple values associated with a key:

param1s := r.URL.Query()["param1"]

Remember, parameter keys are case-sensitive, so it's crucial to match the exact capitalization used in the query string.

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