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
• https://github.com/request/request/issues/89
• https://github.com/urllib3/urllib3/issues/555
• https://github.com/gatling/gatling/issues/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

[tcolombo08]

Also having this issue. Any idea on an ETA of a fix?

[velo]

hi @tcolombo08 feign is mainly driven by volunteer work. ETA depends on someone that is affected by this issue getting involved.