public KinesisSystemDescriptor withProxyHost(String proxyHost) {
    this.proxyHost = Optional.ofNullable(StringUtils.stripToNull(proxyHost));
    return this;
  }
Proxy host to be used for this system.
@param proxyHost Proxy host
@return this system descriptor
samza-aws/src/main/java/org/apache/samza/system/kinesis/descriptors/KinesisSystemDescriptor.java