description

# authenticateProxy property

set authenticateProxy (Future<bool> f(String host, int port, String scheme, String? realm)?)

Sets the function to be called when a proxy is requesting authentication.

Information on the proxy in use, the authentication scheme and the security realm for the authentication are passed in the arguments `f.host`, `f.port`, `f.scheme` and `f.realm`.

The function returns a Future which should complete when the authentication has been resolved. If credentials cannot be provided the Future should complete with `false`. If credentials are available the function should add these using addProxyCredentials before completing the Future with the value `true`.

If the Future completes with `true` the request will be retried using the updated credentials. Otherwise response processing will continue normally.

## Implementation

    void set authenticateProxy(
      Future<bool> Function(String host, int port, String scheme, String? realm)?
      f,
    );