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HttpClient

Need to implement an HttpClient to send requests and receive responses.

Documentation:
https://docs.oracle.com/en/java/javase/12/docs/api/java.net.http/java/net/http/HttpClient.html

Use cases:
https://www.baeldung.com/java-9-http-client

The requests must be:
1 - Asynchronous;

The requests must have:
1 - Authorization header;
2 - Handle for most Content-Types

Make an Authenticator

The server needs to authenticate it's incoming requests before it sends a response.

Checkout documentation:
https://docs.oracle.com/javase/7/docs/api/java/net/Authenticator.html

Example of implementation:


  private UserAuthentication authentication = new UserAuthentication();

  public ApiRestBasicAuthentication(String realm) {
    super(realm);
  }

  @Override
  public Authenticator.Result authenticate(HttpExchange exch) {
      Authenticator.Result result=super.authenticate(exch);
      if(result instanceof Authenticator.Success) {
          HttpPrincipal principal=((Authenticator.Success)result).getPrincipal();
          String requestMethod=exch.getRequestMethod();       
          if( ADD SOME LOGIC HERE FOR PRINCIPAL AND REQUEST METHOD) {
              return new return new Authenticator.Failure(401);
          }
          return result;

      }
  }

  @Override
  public boolean checkCredentials(String user, String pwd) {
    int authCode = authentication.authenticate(user, pwd);
    return authCode == UserAuthentication.USER_AUTHENTICATED;
  }

}```

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