How can I check if a req has a body without trying to parse it in the first place?

[jjoselv]

Do you know if something like hasBody() exists?

[kettanaito]

Hi, @jjoselv.

When handling requests on the web the only way you can check for a body without reading it is by reading the Content-Length header sent in the response. All the other APIs require you to read the body. It makes sense, as body may be represented as a stream, and you have to read that stream to know if there's anything there at all.

Strictly speaking, this is not an MSW-related question. Is there a particular use case you're trying to achieve with the library? If so, please share it, alongside your attempts to do so (code/reproduction repo).

[jjoselv]

Fair enough ☺️ that's for explaining!

[kettanaito]

In real world, you can make a HEAD /resource request that will return you response headers without initiating the body reading. That's where you check Content-Length, if necessary.

[camillecroci]

I'd be careful with the content-length . I tried to use it and ended up with a bug because I would get a response without the property:
https://stackoverflow.com/questions/11375507/getting-response-of-http-request-without-content-length

[kettanaito]

You can also check on request.body. If it's ReadableStream, the request has body. If it's null, it doesn't.