LanguageInterceptor class

An interceptor that automatically adds language information to HTTP request headers.

This interceptor extracts the user's preferred language from the authentication state and includes it in API requests, enabling the backend to provide localized responses.

Behavior:

  • Only adds language header for authenticated users
  • Safely handles cases where authentication bloc is not registered
  • Skips empty or invalid language codes

Header Added:

  • X-Language: The user's language code (e.g., "en", "es", "fr")

Use Cases:

  • Receiving localized error messages from the API
  • Getting content in the user's preferred language
  • Analytics and logging based on user language preferences

Example Request:

GET /api/users
X-Language: en-US

Constructors

LanguageInterceptor()

Properties

hashCode → int
The hash code for this object.
no setterinherited
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited

Methods

noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
onError(DioException err, ErrorInterceptorHandler handler) → void
Called when an exception was occurred during the request.
inherited
onRequest(RequestOptions options, RequestInterceptorHandler handler) → void
Called when the request is about to be sent.
onResponse(Response response, ResponseInterceptorHandler handler) → void
Called when the response is about to be resolved.
inherited
toString() → String
A string representation of this object.
inherited

Operators

operator ==(Object other) → bool
The equality operator.
inherited