RestTemplate client with cookies

Question

I\'m writing a simple client in Java to allow reusable use of proprietary virus scanning software accessible through a RESTful API. To upload a file for scanning the API req

Answer 1

To get more browser like behavior you can use this interceptor:

import java.io.IOException;
import java.net.HttpCookie;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpRequest;
import org.springframework.http.client.ClientHttpRequestExecution;
import org.springframework.http.client.ClientHttpRequestInterceptor;
import org.springframework.http.client.ClientHttpResponse;

public class CookieHandlingClientHttpRequestInterceptor implements ClientHttpRequestInterceptor {

  private static final Logger LOG = LoggerFactory.getLogger(CookieHandlingClientHttpRequestInterceptor.class);

  private final Map cookies = new HashMap<>();

  @Override
  public ClientHttpResponse intercept(HttpRequest request, byte[] body, ClientHttpRequestExecution execution) throws IOException {
    List cookiesForRequest = cookies.values().stream()
        .filter(cookie -> cookie.getPath() != null && request.getURI().getPath().startsWith(cookie.getPath()))
        .map(HttpCookie::toString)
        .collect(Collectors.toList());
    LOG.info("Using cookies: {}", cookiesForRequest);
    request.getHeaders().addAll(HttpHeaders.COOKIE, cookiesForRequest);

    ClientHttpResponse response = execution.execute(request, body);

    List newCookies = response.getHeaders().get(HttpHeaders.SET_COOKIE);
    if (newCookies != null) {
      List parsedCookies = newCookies.stream().flatMap(rawCookie -> HttpCookie.parse(HttpHeaders.SET_COOKIE + ": " + rawCookie).stream()).collect(Collectors.toList());
      LOG.info("Extracted cookies from response: {}", parsedCookies);
      parsedCookies.forEach(newCookie -> cookies.put(newCookie.getName(), newCookie));
    }

    return response;
  }
}

And keep in mind that by default RestTemplate follows redirects for GET requests. In this case the above interceptor is bypassed.