Allow X-Requested-With with value XMLHttpRequest over XmlHttpRequest

[samsonasik]

Reference:

• https://en.wikipedia.org/wiki/List_of_HTTP_header_fields#X-Requested-With

[codecov-commenter]

⚠️ Please install the to ensure uploads and comments are reliably processed by Codecov.

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.64%. Comparing base (0011b99) to head (12395f2).
⚠️ Report is 7 commits behind head on master.
❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #109   +/-   ##
=======================================
  Coverage   98.64%   98.64%           
=======================================
  Files          18       18           
  Lines         296      296           
=======================================
  Hits          292      292           
  Misses          4        4           

Flag	Coverage Δ
tests	98.64% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[Copilot]

Pull request overview

This PR corrects the value of the X-Requested-With header from XmlHttpRequest to XMLHttpRequest to align with the standard convention used by JavaScript libraries like jQuery. The change ensures proper detection of AJAX requests.

• Updates the header value check in the middleware from XmlHttpRequest to XMLHttpRequest
• Updates corresponding test cases to use the corrected header value

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/Middleware/Mezzio.php	Updates the X-Requested-With header value check from 'XmlHttpRequest' to 'XMLHttpRequest'
spec/Middleware/MezzioSpec.php	Updates four test cases to use the corrected 'XMLHttpRequest' header value

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[samsonasik]

Tested with jQuery, which seems using XMLHttpRequest already.