How to Make Query Parameters Optional in Gorilla Mux GET Requests?

Optional Query Parameters in GET Request Using Gorilla Mux

When working with HTTP GET requests in Gorilla Mux, it is often desirable to allow for optional query parameters. By default, specifying a query parameter in the route definition (e.g. Queries("username", "{username}")) makes its presence mandatory.

The Problem

As highlighted in the question, the provided code requires both "username" and "email" query parameters to be present in the request. However, the requirement is to have the flexibility of providing either or both parameters, allowing for optional query strings.

The Solution

To address this, the following steps are recommended:

1. Remove Queries from Route Definition: Remove the Queries block from the route definition, as shown below:

r.HandleFunc("/user", UserByValueHandler).Methods("GET")

2. Extract Query Parameters in Handler Function: In the UserByValueHandler, retrieve the query parameters using r.URL.Query():

func UserByValueHandler(w http.ResponseWriter, r *http.Request) {
       v := r.URL.Query()

       username := v.Get("username")
       email := v.Get("email")
       .....
}

This approach allows for optional query parameters. If a specific parameter is not provided in the request, the v.Get() will return an empty string, which can be handled accordingly in the code.

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