public int createClientKey(feign.Request.Options options) {
    int key = options.connectTimeoutMillis();
    if (options.isFollowRedirects()) {
      key |= 1 << 31; // connectTimeoutMillis always positive, so we can use first sign bit for
      // isFollowRedirects flag
    }
    return key;
  }
Creates integer key that represents {@link Options} settings based on {@link
Http2Client#doesClientConfigurationDiffer(Options)} method

@param options value
@return integer key
java11/src/main/java/feign/http2client/Http2Client.java