RequestUriTooLong from GetMap WMS Service

I’m having problems retrieving images via GetMap from the WMS service.

The request is answered with the error System.Net.HttpStatusCode.RequestUriTooLong and, to avoid it, I would like to know the size limit of the request URL.

I will use Douglas Peucker’s polygon simplification approach until the URL is at the maximum allowed size, thus avoiding the loss of important information in the result image.