[bug]the parm will lost '=' when it's value is empty string

[24kpure]

https://github.com/OpenFeign/feign/blame/2cb72cf3fa6e760a9596aed099f7e83da950360b/core/src/main/java/feign/template/QueryTemplate.java#L86
Example detail just see #910.

My query params are {"key1":"","key2":"value2"}

//expect
http://url?ke1=&key2=value2
//actual
http://url?ke1&key2=value2

[24kpure]

Please assign to me.

[kdavisk6]

Not a bug, but expected behavior. See https://github.com/OpenFeign/feign#undefined-vs-empty-values

[24kpure]

@kdavisk6 Thanks for your response. I have read your url in detail,but the doc mean nothing to myquestion.Please reread my issue description,it is a bug which is brought in a refactor commit.

[24kpure]

@kdavisk6 Reopen the issue，please.