https://bz.apache.org/bugzilla/show_bug.cgi?id=69379
Bug ID: 69379
Summary: HEAD request behavior change does no adhere to RFC
9110
Product: Tomcat 10
Version: 10.1.30
Hardware: PC
OS: Mac OS X 10.1
Status: NEW
Severity: normal
Priority: P2
Component: Catalina
Assignee: dev@tomcat.apache.org
Reporter: m...@jfrog.com
Target Milestone: ------
The behavioral change is part of the following commit:
https://github.com/apache/tomcat/commit/8b5d5ee1fe8c47e3b80b591fedaddc81e5c51a24#diff-8463f112788fc24163560009476ac4509e4fbfb9d970ea4fc9e57de7bcc3f304
According to: https://www.rfc-editor.org/rfc/rfc9110.html#name-head
```
The server SHOULD send the same header fields in response to a HEAD request as
it would have sent if the request method had been GET. However, a server MAY
omit header fields for which a value is determined only while generating the
content.
...
Such a response to GET might contain Content-Length and Vary fields, for
example, that are not generated within a HEAD response
```
`Content-Length: 0` is now set for a HEAD request, while this header should
either be omitted (if the real content length cannot be calculated) or contain
the actual content length of the resource, the same as if a GET request has
been made.
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