Spring Cloud Openfeign feign client http header can not use json string as header value?

Describe the bug I need to use feign client to make a RPC invoke and use a json string value as http header, but I find feign.template.Expressions#create use ":" to split my json string and only use part[0], part[1] to make an Expression. for example: "{"source":"Inner", "traceld":"0b34769c298dccc7e1b0a548"'" as a input header value finally we only get "{"source":"Inner", "traceld"}"

the version I'm using is : spring-cloud-starter-openfeign:3.1.8

Sample for feign client http header key-value common_header: "{"source":"Inner", "traceld":"0b34769c298dccc7e1b0a548"}" but receiver only cat receive: common_header: "{"source":"Inner", "traceld"}"

Comment From: yeti-iasof

hello. any solution?

Comment From: OlgaMaciaszek

Hello, @Gavin16. Spring Cloud OpenFeign 3.1.x is no longer under maintenance. Please upgrade to 4.0.x or 4.1.x. Also, the relates to RequestTemplate that is part of the OpenFeign/Feign project and not SC OpenFeign. You can start a discussion on it there.