How Can I Access Query Strings in Go's HTTP POST Requests?

Accessing Query Strings in POST Requests Using Go's HTTP Package

When working with HTTP POST requests in Go using the http package, you may encounter the need to access and parse query string parameters. Despite the absence of explicit documentation, this can be achieved through the Query() method of the Request object.

Retrieving Query String Parameters

The syntax for extracting query string information looks like this:

func (r *Request) Query() Values

The Query() method returns a Values object, which is essentially a map-like structure where the keys are the parameter names and the values are an array of strings representing the associated parameter values.

Example Usage

Consider a POST request URL with a query string like http://host:port/something?param1=b. Using the Query() method, you can retrieve the query string parameters as follows:

func newHandler(w http.ResponseWriter, r *http.Request) {
  fmt.Println("GET params were:", r.URL.Query())

  // Get a single parameter
  param1 := r.URL.Query().Get("param1")
  if param1 != "" {
    // Process the parameter
  }

  // Get all occurrences of a parameter
  param1s := r.URL.Query()["param1"]
  if len(param1s) > 0 {
    // Process the parameters
  }
}

Note that the keys in the Values object (i.e., the parameter names) are case-sensitive.

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