Default Client does not include Content-Length header for POST with Empty Body

[brennerm]

We are using Feign 10.7.4 to execute a POST request with an empty body. In this case Feign does not add a Content-Length header to the request. According to the HTTP specification this is fine but some proxies, in our case Azure API Management, do not accept POST request with no Content-Length header. Would it be possible to add a Content-Length: 0 header to PATCH, POST and PUT requests with an empty body?

Further context:

• https://stackoverflow.com/a/4198969
• POST requests with empty body should default Content-Length to 0 request/request#89
• Content-length header not set on PUT/POST with empty body urllib3/urllib3#555
• HTTP: Set HTTP header content-length:0 for POST,PUT,PATCH methods when no body is send and method is passed as String gatling/gatling#3648

[velo]

Should be a simple change around this
https://github.com/OpenFeign/feign/blob/master/core/src/main/java/feign/Client.java#L189

What client are you using? Default one? if so, i gave you the correct link.

[brennerm]

We are including spring-cloud-openfeign so I suppose we use the FeignBlockingLoadBalancerClient client class.

[kdavisk6]

@brennerm can you please confirm with the Spring Cloud team that they are passing this through to us first?

[kdavisk6]

In this case, only the default Client implementation is out of compliance. I'm going to update the title of this issue to reference that class and mark this as a bug.

[ameenudheenirshad]

Is there any workaround for this??

[MazizEsa]

@kdavisk6 still need help for this?

[raphmello]

I had the same problem, and solved sending an empty string.

[Yerden01]

If you are using POST/PUT method with RequestParam, instead of this, try using Request body, cause with empty body Feign Client will send Content-Length: 0, and you will face "Length Required" problem

[alexey-plotnikoff]

Have the same problem