Update InnerBrowser.php #15
                
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See Codeception/Codeception#5977
If you merge this, I'll add the same to REST module's
sendPOST()Questions:
X-Requested-With: XMLHttpRequestcorrect? I mean: How is the header added when in fact there is no real request, see Update 04-FunctionalTests.md codeception.github.com#334sendAjaxPostRequest()"