mvc gateway rewritePath filter overwrites GATEWAY_REQUEST_URL_ATTR attribute

[giger85]

Hi, I am testing spring cloud gateway mvc.

Describe the bug
When RewritePath filter applied, then this filter overwrites GATEWAY_REQUEST_URL_ATTR attribute.
In ProxyExchangeHandlerFunction, resolved uri is unexpected value.

Below code might be root cause.

spring-cloud-gateway/spring-cloud-gateway-server-mvc/src/main/java/org/springframework/cloud/gateway/server/mvc/filter/BeforeFilterFunctions.java

Line 319 in c178048

MvcUtils.setRequestUrl(modified, modified.uri());

Sample

• application.yaml

spring.cloud.gateway.mvc:
  routes:
    - id: listRoute1
      uri: https://examplel1.com
      predicates:
        - name: Method
          args:
            methods: GET
        - name: Path
          args:
            pattern: /foo/mytest
      filters:
        - RewritePath=/foo/(?<segment>.*),/bar/${segment}

• curl test

> curl 'http://localhost:8080/foo/mytest'

• expected

https://examplel1.com/bar/mytest

• actual

http://localhost:8080/bar/mytest

[manzhizhen]

I understand is ProxyExchangeHandlerFunction routing path from GATEWAY_REQUEST_URL_ATTR resolution to really, it's not meet your expectations?

[giger85]

@manzhizhen
Yes, it does not meet expectation.
If the official document is provided in near future, then I will check again.

[giger85]

@spencergibb
Thanks for your support.