code: public <T> T flickrPost(Map<String, String> params, Class<T> tClass, boolean sign) throws JinxException {
      return callFlickr(params, Method.POST, tClass, sign);
    }
docs: Call Flickr, returning the specified class deserialized from the Flickr response.
  <br>
  This will make a call to Flickr using http POST. The caller can specify if the request should be signed.
  <p>
  Do not call this method directly. The classes in the net.jeremybrooks.jinx.api package will call this.
  
  @param params request parameters.
  @param tClass the class that will be returned.
  @param <T>    type of the class returned.
  @param sign   if true the request will be signed.
  @return an instance of the specified class containing data from Flickr.
  @throws JinxException if there are any errors.