Some versions of IIS may use an HTTPCompression algorithm that is incompatible with ColdFusion (or Java in general). When using CFHTTP to performthe operations GET or POSTon the target website, if the target site is using Microsoft IIS with HTTP Compression enabled, the CFHTTP tag may report a Connection Failure. If the packets are traced with Ethereal, you might even see that all the compressed data is returned to the CFHTTP tag in the response, and the status code might even be 200 OK. If you are getting a Connection Failure result, the problem is that ColdFusion doesn't know how to deflate the compressed content. If this situation occurs, then you can specify additional headers to be sent with the CFHTTP request which tell the target webserver to disable compression for that response.