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kotlinlang

Hi all, I think I found a bug in `mergeHeaders()` in Ktor.
<https://github.com/ktorio/ktor/blob/3.2.3/ktor-client/ktor-client-core/common/src/io/ktor/client/engine/Utils.kt#L46|This check> uses a case-sensitive comparison. If a caller supplies `content-type` in lowercase, the loop can send it, and the code below adds `Content-Type` again. Some servers reject these duplicate headers.
HTTP header names are case insensitive. Should this check and the adjacent `Content-Length` check use `ignoreCase = true`? Or am I missing something?

Thank you. I've filed an <https://youtrack.jetbrains.com/issue/KTOR-10034|issue>.