this is a reproducing of issue: spring-cloud/spring-cloud-netflix#3300
launch ZuulApplication and MockServerApplication.
request to reproduce:
curl -X POST \
'http://127.0.0.1:8089/test?name=hello%20world' \
-H 'content-type: multipart/form-data;' \
-F key=value
actual: "name = hello world,hello world"
expected: "name = hello world"
curl -X POST \
'http://127.0.0.1:8089/test?name=hello_world' \
-H 'content-type: multipart/form-data;' \
-F key=value
actual: "name = hello_world"
expected: "name = hello_world"
key name has duplicated value if it contains a space (%20) character;