A curl GET (with parameters) is accepted by the server but fails when done with Soap UI NG Pro

Still it is not working, but you made a good point! I got rid of that gzip / compressed part and Ready! API made me restart the tool. 

I added a header "Accept: */*" and the "Content-Type: application/x-www-form-urlencoded"   - the odd thing is that if I added the Content-Length: header and a value of number of bytes in the name/value string, the sending process would go on forever. The square next to the green "send" triangle would stay red. 

So I wonder if that is a clue as to what is going on?

Here is my raw request that I tried sending from the Project tab:

GET https://xx.xx.xx.xxx:xxxxx/a/proprietarypath?myname="myvalue" HTTP/1.1
Authorization: Basic YWRtaW46cGFzc3dvcmQ=
Accept: */*
Content-Type: application/x-www-form-urlencoded
Host: xx.xx.xx.xxx:xxxxx
Connection: Keep-Alive
User-Agent: Apache-HttpClient/4.5.2 (Java/1.8.0_111)

It looks closer to what the curl sent but the curl provided the Content-Length. 

curl -X GET -k --cert certs/client.crt --key certs/client.key -v  -d'myname="myvalue"' 'https://xx.xx.xx.xxx:xxxxx/a/proprietarypath'

here is the summary from the -v 

> GET /a/proprietarypath HTTP/1.1
> User-Agent: curl/7.27.0
> Host: xx.xx.xx.xxx:xxxxx
> Accept: */*
> Content-Length: nn
> Content-Type: application/x-www-form-urlencoded
>

And curl does not show the parameter name/value stuff.

I noticed I can get this google api to work 

curl -X GET -k -v 'http://maps.googleapis.com/maps/api/geocode/xml?address=1600+Amphitheatre+Parkway,+Mountain+view,+CA&sensor=false'

but I cannot get it to respond successfully when trying -d or --data!

curl -X GET -k -v 'http://maps.googleapis.com/maps/api/geocode/xml' -d'address=1600+Amphitheatre+Parkway,+Mountain+view,+CA&sensor=false'