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## org.apache.commons.httpclient.auth
Interface CredentialsProvider

    public interface CredentialsProvider

Credentials provider interface can be used to provide `HTTP method` with a means to request authentication credentials if no credentials have been given or given credentials are incorrect.

HttpClient makes no provisions to check whether the same credentials have been tried already. It is a responsibility of the custom credentials provider to keep track of authentication attempts and to ensure that credentials known to be invalid are not retried. HttpClient will simply store the set of credentials returned by the custom credentials provider in the `http state` object and will attempt to use these credentials for all subsequent requests with the given authentication scope.

Classes implementing this interface must synchronize access to shared data as methods of this interfrace may be executed from multiple threads

Since:
  3.0
Author:
  Ortwin Glueck, Oleg Kalnichevski

Field Summary
`static String` | `PROVIDER` Sets the credentials provider parameter.

Method Summary
`Credentials` | `getCredentials(AuthScheme scheme, String host, int port, boolean proxy)` Requests additional `authentication credentials`.

Field Detail

### PROVIDER

    static final String PROVIDER

  Sets the credentials provider parameter.

  This parameter expects a value of type `CredentialsProvider`.

  See Also:
    Constant Field Values

Method Detail

### getCredentials

    Credentials getCredentials(AuthScheme scheme,
                               String host,
                               int port,
                               boolean proxy)
                               throws CredentialsNotAvailableException

  Requests additional `authentication credentials`.

  Parameters:
    `scheme` - the `authentication scheme`
    `host` - the authentication host
    `port` - the port of the authentication host
    `proxy` - `true` if authenticating with a proxy, `false` otherwise
  Throws:
    `CredentialsNotAvailableException`

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