Tests basic function of the fetch domain.
Request to http://127.0.0.1:8000/devtools/network/resources/resource.php, type: XHR
Response after Fetch.fulfillRequest: overriden response body
Request to http://127.0.0.1:8000/devtools/network/resources/resource.php, type: XHR
Response after fetch.continueRequest: Hello world
Request to http://127.0.0.1:8000/devtools/network/resources/resource.php, type: XHR
Response after fetch.continueRequest with new URL: ******************************************
Request to http://127.0.0.1:8000/devtools/network/resources/resource.php, type: XHR
Response after fetch.failRequest: fail
Sending invalid header (should result in error)
Request to http://127.0.0.1:8000/inspector-protocol/network/resources/echo-headers.php?headers=HTTP_X_DEVTOOLS_TEST, type: XHR
Got error: Invalid header: X-DevTools-Test: