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Description

This PR introduces two breaking changes:

Empty Input body calculation (a5a47b0)

The biggest change is, in most cases, the Content-Length == null will now be detected as Empty Body.

Before:

csharp request.ContentLength == 0

After:

var hasBody = context.HttpContext.Features.Get<IHttpRequestBodyDetectionFeature>()?.CanHaveBody;
// In case the feature is not registered
hasBody ??= context.HttpContext.Request.ContentLength is not null && context.HttpContext.Request.ContentLength != 0;

hasBody == false

Allowing empty FromBody parameters input based on nullability

As described in the #39754 some parameters will now be allowed as empty input parameter. (752b539)

Fixes #39754 #29570