Java Code Examples for java.net.HttpURLConnection#HTTP_MULT_CHOICE

/**
 * Returns true if this response can be stored to later serve another
 * request.
 */
public boolean isCacheable(RequestHeaders request) {
  // Always go to network for uncacheable response codes (RFC 2616, 13.4),
  // This implementation doesn't support caching partial content.
  int responseCode = headers.getResponseCode();
  if (responseCode != HttpURLConnection.HTTP_OK
      && responseCode != HttpURLConnection.HTTP_NOT_AUTHORITATIVE
      && responseCode != HttpURLConnection.HTTP_MULT_CHOICE
      && responseCode != HttpURLConnection.HTTP_MOVED_PERM
      && responseCode != HttpURLConnection.HTTP_GONE) {
    return false;
  }

  // Responses to authorized requests aren't cacheable unless they include
  // a 'public', 'must-revalidate' or 's-maxage' directive.
  if (request.hasAuthorization() && !isPublic && !mustRevalidate && sMaxAgeSeconds == -1) {
    return false;
  }

  if (noStore) {
    return false;
  }

  return true;
}
 

/**
 * Returns true if this response can be stored to later serve another
 * request.
 */
public boolean isCacheable(RequestHeaders request) {
    // Always go to network for uncacheable response codes (RFC 2616, 13.4),
    // This implementation doesn't support caching partial content.
    int responseCode = headers.getResponseCode();
    if (responseCode != HttpURLConnection.HTTP_OK && responseCode != HttpURLConnection.HTTP_NOT_AUTHORITATIVE && responseCode != HttpURLConnection.HTTP_MULT_CHOICE && responseCode != HttpURLConnection.HTTP_MOVED_PERM && responseCode != HttpURLConnection.HTTP_GONE) {
        return false;
    }

    // Responses to authorized requests aren't cacheable unless they include
    // a 'public', 'must-revalidate' or 's-maxage' directive.
    if (request.hasAuthorization() && !isPublic && !mustRevalidate && sMaxAgeSeconds == -1) {
        return false;
    }

    if (noStore) {
        return false;
    }

    return true;
}
 

/**
 * Returns true if this response can be stored to later serve another
 * request.
 */
public boolean isCacheable(RequestHeaders request) {
  // Always go to network for uncacheable response codes (RFC 2616, 13.4),
  // This implementation doesn't support caching partial content.
  int responseCode = headers.getResponseCode();
  if (responseCode != HttpURLConnection.HTTP_OK
      && responseCode != HttpURLConnection.HTTP_NOT_AUTHORITATIVE
      && responseCode != HttpURLConnection.HTTP_MULT_CHOICE
      && responseCode != HttpURLConnection.HTTP_MOVED_PERM
      && responseCode != HttpURLConnection.HTTP_GONE) {
    return false;
  }

  // Responses to authorized requests aren't cacheable unless they include
  // a 'public', 'must-revalidate' or 's-maxage' directive.
  if (request.hasAuthorization() && !isPublic && !mustRevalidate && sMaxAgeSeconds == -1) {
    return false;
  }

  if (noStore) {
    return false;
  }

  return true;
}
 

public static URI unredirect(URI uri) throws IOException {
  if (!REDIRECTOR_DOMAINS.contains(uri.getHost())) {
    return uri;
  }
  URL url = uri.toURL();
  HttpURLConnection connection = safelyOpenConnection(url);
  connection.setInstanceFollowRedirects(false);
  connection.setDoInput(false);
  connection.setRequestMethod("HEAD");
  connection.setRequestProperty("User-Agent", "ZXing (Android)");
  try {
    int responseCode = safelyConnect(connection);
    switch (responseCode) {
      case HttpURLConnection.HTTP_MULT_CHOICE:
      case HttpURLConnection.HTTP_MOVED_PERM:
      case HttpURLConnection.HTTP_MOVED_TEMP:
      case HttpURLConnection.HTTP_SEE_OTHER:
      case 307: // No constant for 307 Temporary Redirect ?
        String location = connection.getHeaderField("Location");
        if (location != null) {
          try {
            return new URI(location);
          } catch (URISyntaxException e) {
            // nevermind
          }
        }
    }
    return uri;
  } finally {
    connection.disconnect();
  }
}
 

public static URI unredirect(URI uri) throws IOException {
  if (!REDIRECTOR_DOMAINS.contains(uri.getHost())) {
    return uri;
  }
  URL url = uri.toURL();
  HttpURLConnection connection = safelyOpenConnection(url);
  connection.setInstanceFollowRedirects(false);
  connection.setDoInput(false);
  connection.setRequestMethod("HEAD");
  connection.setRequestProperty("User-Agent", "ZXing (Android)");
  try {
    int responseCode = safelyConnect(connection);
    switch (responseCode) {
      case HttpURLConnection.HTTP_MULT_CHOICE:
      case HttpURLConnection.HTTP_MOVED_PERM:
      case HttpURLConnection.HTTP_MOVED_TEMP:
      case HttpURLConnection.HTTP_SEE_OTHER:
      case 307: // No constant for 307 Temporary Redirect ?
        String location = connection.getHeaderField("Location");
        if (location != null) {
          try {
            return new URI(location);
          } catch (URISyntaxException e) {
            // nevermind
          }
        }
    }
    return uri;
  } finally {
    connection.disconnect();
  }
}
 

private static boolean isRedirect(int code) {
    return code == HttpURLConnection.HTTP_MOVED_PERM
            || code == HttpURLConnection.HTTP_MOVED_TEMP
            || code == HttpURLConnection.HTTP_SEE_OTHER
            || code == HttpURLConnection.HTTP_MULT_CHOICE
            || code == HTTP_TEMPORARY_REDIRECT
            || code == HTTP_PERMANENT_REDIRECT;
}
 

protected <T> void responseHandler(AsyncResult<HttpResponse<T>> ar, CompletableFuture<T> promise, Predicate<Integer> expectedCodePredicate,
        String expectedCodeOrCodes, String warnMessage, boolean throwException) {
    try {
        if (ar.succeeded()) {
            HttpResponse<T> response = ar.result();
            T body = response.body();
            if (expectedCodePredicate.negate().test(response.statusCode())) {
                log.error("expected-code: {}, response-code: {}, body: {}, op: {}", expectedCodeOrCodes, response.statusCode(), response.body(), warnMessage);
                promise.completeExceptionally(new RuntimeException("Status " + response.statusCode() + " body: " + (body != null ? body.toString() : null)));
            } else if (response.statusCode() < HTTP_OK || response.statusCode() >= HttpURLConnection.HTTP_MULT_CHOICE) {
                if (throwException) {
                    promise.completeExceptionally(new RuntimeException(body == null ? "null" : body.toString()));
                } else {
                    promise.complete(ar.result().body());
                }
            } else {
                promise.complete(ar.result().body());
            }
        } else {
            log.warn("Request failed: {}", warnMessage, ar.cause());
            promise.completeExceptionally(ar.cause());
        }
    } catch (io.vertx.core.json.DecodeException decEx) {
        if (ar.result().bodyAsString().toLowerCase().contains("application is not available")) {
            log.warn("'{}' is not available.", apiClientName(), ar.cause());
            throw new IllegalStateException(String.format("'%s' is not available.", apiClientName()));
        } else {
            log.warn("Unexpected object received", ar.cause());
            throw new IllegalStateException("JsonObject expected, but following object was received: " + ar.result().bodyAsString());
        }
    }
}
 

public static URI unredirect(URI uri) throws IOException {
  if (!REDIRECTOR_DOMAINS.contains(uri.getHost())) {
    return uri;
  }
  URL url = uri.toURL();
  HttpURLConnection connection = safelyOpenConnection(url);
  connection.setInstanceFollowRedirects(false);
  connection.setDoInput(false);
  connection.setRequestMethod("HEAD");
  connection.setRequestProperty("User-Agent", "ZXing (Android)");
  try {
    int responseCode = safelyConnect(connection);
    switch (responseCode) {
      case HttpURLConnection.HTTP_MULT_CHOICE:
      case HttpURLConnection.HTTP_MOVED_PERM:
      case HttpURLConnection.HTTP_MOVED_TEMP:
      case HttpURLConnection.HTTP_SEE_OTHER:
      case 307: // No constant for 307 Temporary Redirect ?
        String location = connection.getHeaderField("Location");
        if (location != null) {
          try {
            return new URI(location);
          } catch (URISyntaxException e) {
            // nevermind
          }
        }
    }
    return uri;
  } finally {
    connection.disconnect();
  }
}
 

public static URI unredirect(URI uri) throws IOException {
  if (!REDIRECTOR_DOMAINS.contains(uri.getHost())) {
    return uri;
  }
  URL url = uri.toURL();
  HttpURLConnection connection = safelyOpenConnection(url);
  connection.setInstanceFollowRedirects(false);
  connection.setDoInput(false);
  connection.setRequestMethod("HEAD");
  connection.setRequestProperty("User-Agent", "ZXing (Android)");
  try {
    int responseCode = safelyConnect(connection);
    switch (responseCode) {
      case HttpURLConnection.HTTP_MULT_CHOICE:
      case HttpURLConnection.HTTP_MOVED_PERM:
      case HttpURLConnection.HTTP_MOVED_TEMP:
      case HttpURLConnection.HTTP_SEE_OTHER:
      case 307: // No constant for 307 Temporary Redirect ?
        String location = connection.getHeaderField("Location");
        if (location != null) {
          try {
            return new URI(location);
          } catch (URISyntaxException e) {
            // nevermind
          }
        }
    }
    return uri;
  } finally {
    connection.disconnect();
  }
}
 

private static boolean isHttpRedirect(int responseCode) {
  switch (responseCode) {
    case HttpURLConnection.HTTP_MULT_CHOICE:
    case HttpURLConnection.HTTP_MOVED_PERM:
    case HttpURLConnection.HTTP_MOVED_TEMP:
    case HttpURLConnection.HTTP_SEE_OTHER:
    case HTTP_TEMPORARY_REDIRECT:
    case HTTP_PERMANENT_REDIRECT:
      return true;
    default:
      return false;
  }
}
 

private static boolean isRedirection(int code) {
    return code == HttpURLConnection.HTTP_MOVED_PERM
            || code == HttpURLConnection.HTTP_MOVED_TEMP
            || code == HttpURLConnection.HTTP_SEE_OTHER
            || code == HttpURLConnection.HTTP_MULT_CHOICE
            || code == Constants.HTTP_TEMPORARY_REDIRECT
            || code == Constants.HTTP_PERMANENT_REDIRECT;
}
 

public static URI unredirect(URI uri) throws IOException {
  if (!REDIRECTOR_DOMAINS.contains(uri.getHost())) {
    return uri;
  }
  URL url = uri.toURL();

  HttpURLConnection connection = (HttpURLConnection) url.openConnection();
  connection.setInstanceFollowRedirects(false);
  connection.setDoInput(false);
  connection.setRequestMethod("HEAD");
  connection.setRequestProperty("User-Agent", "ZXing (Android)");
  try {
    connection.connect();
    switch (connection.getResponseCode()) {
      case HttpURLConnection.HTTP_MULT_CHOICE:
      case HttpURLConnection.HTTP_MOVED_PERM:
      case HttpURLConnection.HTTP_MOVED_TEMP:
      case HttpURLConnection.HTTP_SEE_OTHER:
      case 307: // No constant for 307 Temporary Redirect ?
        String location = connection.getHeaderField("Location");
        if (location != null) {
          try {
            return new URI(location);
          } catch (URISyntaxException e) {
            // nevermind
          }
        }
    }
    return uri;
  } finally {
    connection.disconnect();
  }
}
 

public static URI unredirect(URI uri) throws IOException {
  if (!REDIRECTOR_DOMAINS.contains(uri.getHost())) {
    return uri;
  }
  URL url = uri.toURL();
  HttpURLConnection connection = safelyOpenConnection(url);
  connection.setInstanceFollowRedirects(false);
  connection.setDoInput(false);
  connection.setRequestMethod("HEAD");
  connection.setRequestProperty("User-Agent", "ZXing (Android)");
  try {
    int responseCode = safelyConnect(connection);
    switch (responseCode) {
      case HttpURLConnection.HTTP_MULT_CHOICE:
      case HttpURLConnection.HTTP_MOVED_PERM:
      case HttpURLConnection.HTTP_MOVED_TEMP:
      case HttpURLConnection.HTTP_SEE_OTHER:
      case 307: // No constant for 307 Temporary Redirect ?
        String location = connection.getHeaderField("Location");
        if (location != null) {
          try {
            return new URI(location);
          } catch (URISyntaxException e) {
            // nevermind
          }
        }
    }
    return uri;
  } finally {
    connection.disconnect();
  }
}
 

/**
 * Establishes a connection, following redirects to do so where permitted.
 */
private HttpURLConnection makeConnection(DataSpec dataSpec) throws IOException {
  URL url = new URL(dataSpec.uri.toString());
  @HttpMethod int httpMethod = dataSpec.httpMethod;
  byte[] httpBody = dataSpec.httpBody;
  long position = dataSpec.position;
  long length = dataSpec.length;
  boolean allowGzip = dataSpec.isFlagSet(DataSpec.FLAG_ALLOW_GZIP);
  boolean allowIcyMetadata = dataSpec.isFlagSet(DataSpec.FLAG_ALLOW_ICY_METADATA);

  if (!allowCrossProtocolRedirects) {
    // HttpURLConnection disallows cross-protocol redirects, but otherwise performs redirection
    // automatically. This is the behavior we want, so use it.
    return makeConnection(
        url,
        httpMethod,
        httpBody,
        position,
        length,
        allowGzip,
        allowIcyMetadata,
        /* followRedirects= */ true);
  }

  // We need to handle redirects ourselves to allow cross-protocol redirects.
  int redirectCount = 0;
  while (redirectCount++ <= MAX_REDIRECTS) {
    HttpURLConnection connection =
        makeConnection(
            url,
            httpMethod,
            httpBody,
            position,
            length,
            allowGzip,
            allowIcyMetadata,
            /* followRedirects= */ false);
    int responseCode = connection.getResponseCode();
    String location = connection.getHeaderField("Location");
    if ((httpMethod == DataSpec.HTTP_METHOD_GET || httpMethod == DataSpec.HTTP_METHOD_HEAD)
        && (responseCode == HttpURLConnection.HTTP_MULT_CHOICE
            || responseCode == HttpURLConnection.HTTP_MOVED_PERM
            || responseCode == HttpURLConnection.HTTP_MOVED_TEMP
            || responseCode == HttpURLConnection.HTTP_SEE_OTHER
            || responseCode == HTTP_STATUS_TEMPORARY_REDIRECT
            || responseCode == HTTP_STATUS_PERMANENT_REDIRECT)) {
      connection.disconnect();
      url = handleRedirect(url, location);
    } else if (httpMethod == DataSpec.HTTP_METHOD_POST
        && (responseCode == HttpURLConnection.HTTP_MULT_CHOICE
            || responseCode == HttpURLConnection.HTTP_MOVED_PERM
            || responseCode == HttpURLConnection.HTTP_MOVED_TEMP
            || responseCode == HttpURLConnection.HTTP_SEE_OTHER)) {
      // POST request follows the redirect and is transformed into a GET request.
      connection.disconnect();
      httpMethod = DataSpec.HTTP_METHOD_GET;
      httpBody = null;
      url = handleRedirect(url, location);
    } else {
      return connection;
    }
  }

  // If we get here we've been redirected more times than are permitted.
  throw new NoRouteToHostException("Too many redirects: " + redirectCount);
}
 

/**
 * Establishes a connection, following redirects to do so where permitted.
 */
private HttpURLConnection makeConnection(DataSpec dataSpec) throws IOException {
    URL url = new URL(dataSpec.uri.toString());
    @HttpMethod int httpMethod = dataSpec.httpMethod;
    byte[] httpBody = dataSpec.httpBody;
    long position = dataSpec.position;
    long length = dataSpec.length;
    boolean allowGzip = dataSpec.isFlagSet(DataSpec.FLAG_ALLOW_GZIP);

    if (!allowCrossProtocolRedirects) {
        // HttpURLConnection disallows cross-protocol redirects, but otherwise performs redirection
        // automatically. This is the behavior we want, so use it.
        return makeConnection(
                url,
                httpMethod,
                httpBody,
                position,
                length,
                allowGzip,
                /* followRedirects= */ true,
                dataSpec.httpRequestHeaders);
    }

    // We need to handle redirects ourselves to allow cross-protocol redirects.
    int redirectCount = 0;
    while (redirectCount++ <= MAX_REDIRECTS) {
        HttpURLConnection connection =
                makeConnection(
                        url,
                        httpMethod,
                        httpBody,
                        position,
                        length,
                        allowGzip,
                        /* followRedirects= */ false,
                        dataSpec.httpRequestHeaders);
        int responseCode = connection.getResponseCode();
        String location = connection.getHeaderField("Location");
        if ((httpMethod == DataSpec.HTTP_METHOD_GET || httpMethod == DataSpec.HTTP_METHOD_HEAD)
                && (responseCode == HttpURLConnection.HTTP_MULT_CHOICE
                || responseCode == HttpURLConnection.HTTP_MOVED_PERM
                || responseCode == HttpURLConnection.HTTP_MOVED_TEMP
                || responseCode == HttpURLConnection.HTTP_SEE_OTHER
                || responseCode == HTTP_STATUS_TEMPORARY_REDIRECT
                || responseCode == HTTP_STATUS_PERMANENT_REDIRECT)) {
            connection.disconnect();
            url = handleRedirect(url, location);
        } else if (httpMethod == DataSpec.HTTP_METHOD_POST
                && (responseCode == HttpURLConnection.HTTP_MULT_CHOICE
                || responseCode == HttpURLConnection.HTTP_MOVED_PERM
                || responseCode == HttpURLConnection.HTTP_MOVED_TEMP
                || responseCode == HttpURLConnection.HTTP_SEE_OTHER)) {
            // POST request follows the redirect and is transformed into a GET request.
            connection.disconnect();
            httpMethod = DataSpec.HTTP_METHOD_GET;
            httpBody = null;
            url = handleRedirect(url, location);
        } else {
            return connection;
        }
    }

    // If we get here we've been redirected more times than are permitted.
    throw new NoRouteToHostException("Too many redirects: " + redirectCount);
}
 

private static boolean isHttpSuccess(int responseCode) {
  return (responseCode >= HttpURLConnection.HTTP_OK
      && responseCode < HttpURLConnection.HTTP_MULT_CHOICE);
}
 

/**
 * Establishes a connection, following redirects to do so where permitted.
 */
private HttpURLConnection makeConnection(DataSpec dataSpec) throws IOException {
  URL url = new URL(dataSpec.uri.toString());
  byte[] postBody = dataSpec.postBody;
  long position = dataSpec.position;
  long length = dataSpec.length;
  boolean allowGzip = dataSpec.isFlagSet(DataSpec.FLAG_ALLOW_GZIP);

  if (!allowCrossProtocolRedirects) {
    // HttpURLConnection disallows cross-protocol redirects, but otherwise performs redirection
    // automatically. This is the behavior we want, so use it.
    return makeConnection(url, postBody, position, length, allowGzip, true /* followRedirects */);
  }

  // We need to handle redirects ourselves to allow cross-protocol redirects.
  int redirectCount = 0;
  while (redirectCount++ <= MAX_REDIRECTS) {
    HttpURLConnection connection = makeConnection(
        url, postBody, position, length, allowGzip, false /* followRedirects */);
    int responseCode = connection.getResponseCode();
    if (responseCode == HttpURLConnection.HTTP_MULT_CHOICE
        || responseCode == HttpURLConnection.HTTP_MOVED_PERM
        || responseCode == HttpURLConnection.HTTP_MOVED_TEMP
        || responseCode == HttpURLConnection.HTTP_SEE_OTHER
        || (postBody == null
            && (responseCode == 307 /* HTTP_TEMP_REDIRECT */
                || responseCode == 308 /* HTTP_PERM_REDIRECT */))) {
      // For 300, 301, 302, and 303 POST requests follow the redirect and are transformed into
      // GET requests. For 307 and 308 POST requests are not redirected.
      postBody = null;
      String location = connection.getHeaderField("Location");
      connection.disconnect();
      url = handleRedirect(url, location);
    } else {
      return connection;
    }
  }

  // If we get here we've been redirected more times than are permitted.
  throw new NoRouteToHostException("Too many redirects: " + redirectCount);
}
 

/**
 * Establishes a connection, following redirects to do so where permitted.
 */
private HttpURLConnection makeConnection(DataSpec dataSpec) throws IOException {
  URL url = new URL(dataSpec.uri.toString());
  byte[] postBody = dataSpec.postBody;
  long position = dataSpec.position;
  long length = dataSpec.length;
  boolean allowGzip = dataSpec.isFlagSet(DataSpec.FLAG_ALLOW_GZIP);

  if (!allowCrossProtocolRedirects) {
    // HttpURLConnection disallows cross-protocol redirects, but otherwise performs redirection
    // automatically. This is the behavior we want, so use it.
    return makeConnection(url, postBody, position, length, allowGzip, true /* followRedirects */);
  }

  // We need to handle redirects ourselves to allow cross-protocol redirects.
  int redirectCount = 0;
  while (redirectCount++ <= MAX_REDIRECTS) {
    HttpURLConnection connection = makeConnection(
        url, postBody, position, length, allowGzip, false /* followRedirects */);
    int responseCode = connection.getResponseCode();
    if (responseCode == HttpURLConnection.HTTP_MULT_CHOICE
        || responseCode == HttpURLConnection.HTTP_MOVED_PERM
        || responseCode == HttpURLConnection.HTTP_MOVED_TEMP
        || responseCode == HttpURLConnection.HTTP_SEE_OTHER
        || (postBody == null
            && (responseCode == 307 /* HTTP_TEMP_REDIRECT */
                || responseCode == 308 /* HTTP_PERM_REDIRECT */))) {
      // For 300, 301, 302, and 303 POST requests follow the redirect and are transformed into
      // GET requests. For 307 and 308 POST requests are not redirected.
      postBody = null;
      String location = connection.getHeaderField("Location");
      connection.disconnect();
      url = handleRedirect(url, location);
    } else {
      return connection;
    }
  }

  // If we get here we've been redirected more times than are permitted.
  throw new NoRouteToHostException("Too many redirects: " + redirectCount);
}
 

/**
 * Establishes a connection, following redirects to do so where permitted.
 */
private HttpURLConnection makeConnection(DataSpec dataSpec) throws IOException {
  URL url = new URL(dataSpec.uri.toString());
  @HttpMethod int httpMethod = dataSpec.httpMethod;
  byte[] httpBody = dataSpec.httpBody;
  long position = dataSpec.position;
  long length = dataSpec.length;
  boolean allowGzip = dataSpec.isFlagSet(DataSpec.FLAG_ALLOW_GZIP);
  boolean allowIcyMetadata = dataSpec.isFlagSet(DataSpec.FLAG_ALLOW_ICY_METADATA);

  if (!allowCrossProtocolRedirects) {
    // HttpURLConnection disallows cross-protocol redirects, but otherwise performs redirection
    // automatically. This is the behavior we want, so use it.
    return makeConnection(
        url,
        httpMethod,
        httpBody,
        position,
        length,
        allowGzip,
        allowIcyMetadata,
        /* followRedirects= */ true);
  }

  // We need to handle redirects ourselves to allow cross-protocol redirects.
  int redirectCount = 0;
  while (redirectCount++ <= MAX_REDIRECTS) {
    HttpURLConnection connection =
        makeConnection(
            url,
            httpMethod,
            httpBody,
            position,
            length,
            allowGzip,
            allowIcyMetadata,
            /* followRedirects= */ false);
    int responseCode = connection.getResponseCode();
    String location = connection.getHeaderField("Location");
    if ((httpMethod == DataSpec.HTTP_METHOD_GET || httpMethod == DataSpec.HTTP_METHOD_HEAD)
        && (responseCode == HttpURLConnection.HTTP_MULT_CHOICE
            || responseCode == HttpURLConnection.HTTP_MOVED_PERM
            || responseCode == HttpURLConnection.HTTP_MOVED_TEMP
            || responseCode == HttpURLConnection.HTTP_SEE_OTHER
            || responseCode == HTTP_STATUS_TEMPORARY_REDIRECT
            || responseCode == HTTP_STATUS_PERMANENT_REDIRECT)) {
      connection.disconnect();
      url = handleRedirect(url, location);
    } else if (httpMethod == DataSpec.HTTP_METHOD_POST
        && (responseCode == HttpURLConnection.HTTP_MULT_CHOICE
            || responseCode == HttpURLConnection.HTTP_MOVED_PERM
            || responseCode == HttpURLConnection.HTTP_MOVED_TEMP
            || responseCode == HttpURLConnection.HTTP_SEE_OTHER)) {
      // POST request follows the redirect and is transformed into a GET request.
      connection.disconnect();
      httpMethod = DataSpec.HTTP_METHOD_GET;
      httpBody = null;
      url = handleRedirect(url, location);
    } else {
      return connection;
    }
  }

  // If we get here we've been redirected more times than are permitted.
  throw new NoRouteToHostException("Too many redirects: " + redirectCount);
}
 

/**
 * Map from HTTP status code to reason description.
 * Sentry HTTP breadcrumbs expect a text description of the HTTP status-code.
 * This function implements a look-up table with a default value for unknown status-codes.
 * @param statusCode an integer HTTP status code, expected to be in the range [200,505].
 * @return a non-empty string in all cases.
 */
private static String httpReason(int statusCode) {
    switch (statusCode) {
        // 2xx
        case HttpURLConnection.HTTP_OK: return "OK";
        case HttpURLConnection.HTTP_CREATED: return "Created";
        case HttpURLConnection.HTTP_ACCEPTED: return "Accepted";
        case HttpURLConnection.HTTP_NOT_AUTHORITATIVE: return "Non-Authoritative Information";
        case HttpURLConnection.HTTP_NO_CONTENT: return "No Content";
        case HttpURLConnection.HTTP_RESET: return "Reset Content";
        case HttpURLConnection.HTTP_PARTIAL: return "Partial Content";

        // 3xx
        case HttpURLConnection.HTTP_MULT_CHOICE: return "Multiple Choices";
        case HttpURLConnection.HTTP_MOVED_PERM: return "Moved Permanently";
        case HttpURLConnection.HTTP_MOVED_TEMP: return "Temporary Redirect";
        case HttpURLConnection.HTTP_SEE_OTHER: return "See Other";
        case HttpURLConnection.HTTP_NOT_MODIFIED: return "Not Modified";
        case HttpURLConnection.HTTP_USE_PROXY: return "Use Proxy";

        // 4xx
        case HttpURLConnection.HTTP_BAD_REQUEST: return "Bad Request";
        case HttpURLConnection.HTTP_UNAUTHORIZED: return "Unauthorized";
        case HttpURLConnection.HTTP_PAYMENT_REQUIRED: return "Payment Required";
        case HttpURLConnection.HTTP_FORBIDDEN: return "Forbidden";
        case HttpURLConnection.HTTP_NOT_FOUND: return "Not Found";
        case HttpURLConnection.HTTP_BAD_METHOD: return "Method Not Allowed";
        case HttpURLConnection.HTTP_NOT_ACCEPTABLE: return "Not Acceptable";
        case HttpURLConnection.HTTP_PROXY_AUTH: return "Proxy Authentication Required";
        case HttpURLConnection.HTTP_CLIENT_TIMEOUT: return "Request Time-Out";
        case HttpURLConnection.HTTP_CONFLICT: return "Conflict";
        case HttpURLConnection.HTTP_GONE: return "Gone";
        case HttpURLConnection.HTTP_LENGTH_REQUIRED: return "Length Required";
        case HttpURLConnection.HTTP_PRECON_FAILED: return "Precondition Failed";
        case HttpURLConnection.HTTP_ENTITY_TOO_LARGE: return "Request Entity Too Large";
        case HttpURLConnection.HTTP_REQ_TOO_LONG: return "Request-URI Too Large";
        case HttpURLConnection.HTTP_UNSUPPORTED_TYPE: return "Unsupported Media Type";

        // 5xx
        case HttpURLConnection.HTTP_INTERNAL_ERROR: return "Internal Server Error";
        case HttpURLConnection.HTTP_NOT_IMPLEMENTED: return "Not Implemented";
        case HttpURLConnection.HTTP_BAD_GATEWAY: return "Bad Gateway";
        case HttpURLConnection.HTTP_UNAVAILABLE: return "Service Unavailable";
        case HttpURLConnection.HTTP_GATEWAY_TIMEOUT: return "Gateway Timeout";
        case HttpURLConnection.HTTP_VERSION: return "Version Not Supported";

        default: return "unknown";
    }
}