feat(request): add req.hasBody getter

[walle250ai]

Summary

• Add req.hasBody boolean getter to lib/request.js
• Returns true if request carries a non-empty body: Content-Length > 0 OR Transfer-Encoding header present
• Returns false for Content-Length: 0, missing content headers
• Follows existing defineGetter pattern (same as req.fresh, req.xhr, etc.)
• No new dependencies

Motivation

Express has no built-in way to check if a request has a body before parsing. Developers currently repeat req.headers["content-length"] checks across middleware. req.hasBody surfaces this as a first-class property.

Test plan

• POST with Content-Length > 0 → true
• GET with Content-Length: 0 → false
• Request with Transfer-Encoding: chunked → true
• Request with no content headers → false
• All 4 tests pass: mocha --require test/support/env test/req.hasBody.js

🤖 Generated with Claude Code

[krzysdz]

I see two problems with this:

1. given the name, one would assume that req.body is not empty when req.hasBody() is true, but req.body is created by middleware (e.g. body-parser), while this implements a much lower level primitive,
2. type-is already implements this and it is an Express dependency through body-parser, which uses it to check if the request has a body.

By the way, I did not see anybody requesting adding this functionality directly to Express.