I am using (SAS 9.4 M5 on Linux)  PROC HTTP to call an in-house Windows API. I use POST and pass JSON file in, and it returns a JSON file.  To speed the process up I want to GZIP the JSON in and out. The input of the GZIP'd JSON works fine for all file sizes. The output in JSON format works for all file sizes. The output in GZIP'd format works if the resulting .gz file is < 65 KB, BUT fails for anything larger.   I can run the cURL from DOS which passes .gz file from Linux box location via the windows API and it writes a resulting .gz file to Linux (whether input large or small).   What can i add to the filename statement for the .gz file - to resolve size issue?  What can i add to the proc http ?    filename inZIPd "&theFilePath./&theDSname._toACS.json.gz"; filename outZIPd "&theFilePath./&theDSname._resp.json.gz";   proc http url = &URLString. method = "POST" in = inZIPd out = outZIPd; headers "Content-Type" = "application/json" "Content-Encoding" = "gzip" "Accept" = "application/json" "Accept-Encoding" = "gzip" ; run;   ... View more