Billy Jaime Beltran created HTTPCORE-759:
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Summary: 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
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]
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