[Bug]: Expose stuck on request header 'Expect: 100-continue'

[nickvleeuwen]

System architecture

Mac, ARM64 (M1, M2, etc)

PHP Version

8.2

Bug description

Hello,

My Expose is getting stuck when a request has a request header 'Expect: 100-continue'. The request is processed by Laravel perfectly, in the request a database record is being created fine, Laravel Telescope even logs a 200 success response. But the external application(Exact Online) that sends the request never gets the 200 success response. Because its send by an external application I have no control over the request headers being added.

When I copy the request from Laravel Telescope and send it with Postman to the same Expose url with the request header present, my postman gets stuck on 'Sending Request...', again, the request has an 200 success response according to Laravel Telescope.
When I disable the request header 'Expect: 100-continue' in Postman, the request doesn't get stuck and I receive the 200 response in Postman.

Steps to reproduce

1. Turn on expose.
2. Make an request in postman and set your url to your exposed url.
3. In 'Headers' tab, add the following request header: 'Expect: 100-continue' (Key: Except, Value: 100-continue).
4. press 'send'.

Relevant log output

No response