How to Handle Optional Parameters in GET Requests with Gorilla Mux?

Optional Parameters in GET Requests with Gorilla Mux

When defining query parameters using Gorilla Mux, it can be useful to make certain parameters optional. To achieve this, the following steps can be taken:

1. Modify Route Configuration:

   • Change the Queries() method to use the Build() function to create a custom Mux router. For example, replace:

     r.HandleFunc("/user", userByValueHandler).
         Queries(
             "username", "{username}",
             "email", "{email}",
         ).
         Methods("GET")

     with:

     router := r.PathPrefix("/user").Subrouter()
     router.Methods("GET").BuildOnly()

2. Handle Optional Parameters in Handler Function:

   • In the handler function, use r.URL.Query() to retrieve the query parameters and check for their presence using .Get(). For instance, instead of:

     username := r.URL.Query().Get("username")
     email := r.URL.Query().Get("email")

     write:

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

   • This allows for optional parameters since the handler can handle cases where none or either of the parameters are provided in the request.

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