retrofit2.http

Annotation Type Tag

@Documented
 @Target(value=PARAMETER)
 @Retention(value=RUNTIME)
public @interface Tag

Adds the argument instance as a request tag using the type as the key.

 @GET("/")
 Call<ResponseBody> foo(@Tag String tag);
 

Tag arguments may be null which will omit them from the request. Passing a parameterized type such as List<String> will use the raw type (i.e., List.class) as the key. Duplicate tag types are not allowed.