Why Remove Content-Length in Gateway MVC？

[sunhao1256]

Describe the bug
I communicate with downstream server , At beginning I send request with okhttp manutally and everything is ok , when i integrate spring gateway mvc，i got 500 error like form encode escape % etc. after i dive into deep code , i found an odd Request Filter RemoveContentLengthRequestHeadersFilter

why we need remove content-lengh ,i can't understand the meaning of the comment on top.

// jdk http clients seem to not like having this copied from the initial request. // urlconnection fails with form url encoded

[spencergibb]

The jdk http client will fail with an error if not removed.

[spring-cloud-issues]

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[spring-cloud-issues]

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[jensmatw]

The jdk http client will fail with an error if not removed.

What error will occur, maybe I can invstigate a bit if I know the error? I think it is a big problem if (in case of mvc) the ´Content-Lengthis just removed. For my project, after migrating to mvc, I set the remove-content-length-request-headers-filter.enabled to false with having only one issue with a 3rd party service which raises a strange exception, all my other downstream services are working fine (and one of them really needsContent-Length`).