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https://issues.apache.org/jira/browse/HTTPCORE-759?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17770393#comment-17770393
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Arturo Bernal commented on HTTPCORE-759:
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I agree with your [~michael-o] , interpretation of RFC 9110. It clearly
states that a 'Content-Length' header should not be sent when the request
doesn't contain content and the method doesn't anticipate such data.
> Content-Length missing on null entity request content
> -----------------------------------------------------
>
> Key: HTTPCORE-759
> URL: https://issues.apache.org/jira/browse/HTTPCORE-759
> Project: HttpComponents HttpCore
> Issue Type: Improvement
> Components: HttpCore
> Affects Versions: 5.2.2
> Reporter: Billy Jaime Beltran
> Priority: Minor
> Labels: easyfix
> Time Spent: 10m
> Remaining Estimate: 0h
>
> When making a POST request with an empty body, the following difference in
> behaviour was observed.
> In HttpComponents 4.4.x, a null body causes a Content-Length zero header to
> be added.
> In HttpComponents 5.2.x, a null body causes no Content-Length headers being
> added.
> While upgrading an Apache Camel application, we noticed that this breaks
> calls to an upstream IIS server which replies with 411 (Length Required).
> That server expects either a Content-Length 0 or a Transfer-Encoding: chunked
> header (with a chunk-size of zero) on requests that have a body semantic
> (POST, PUT).
> As the code currently stands written, if we manually set `Content-Length: 0`
> a ProtocolException is thrown
> [RequestContent.java:106|https://github.com/apache/httpcomponents-core/blob/e3c770b55602eb9e5a45dfe7c6a07a1adede2c95/httpcore5/src/main/java/org/apache/hc/core5/http/protocol/RequestContent.java#L106]
> and if we call the constructor with overwrite, this header is removed anyway
> without being replaced.
> The previous behaviour (4.x) is documented
> [RequestContent.java:102|https://github.com/apache/httpcomponents-core/blob/a5c117028b7c620974304636d52f06f172f1d08b/httpcore/src/main/java/org/apache/http/protocol/RequestContent.java#L102]
>
> A suggested fix: re-add the null check and set Content-Length to zero.
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