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 will use the raw type as the key (e.g., List<String> uses List.class). Primitive types will be boxed and stored using the boxed type (e.g., long uses Long.class). Duplicate tag types are not allowed.