X-ThousandEyes-Agent: yes. This header is necessary to identify requests as originating from a ThousandEyes agent.
(ThousandEyes Agent)identifier text is included in the User Agent request header. When selected, the User Agent dropdown options will update to display "(TE)" after every option name to signify that this identifier text is appended to the User Agent request header. Whenever the User Agent text input is visible the identifier text will be included at the end of the displayed text. If the identifier text is subsequently modified or removed from the text input while the "Extend User Agent Header" option is selected, the test configuration will not be valid and saving the test configuration will be prevented until the identifier text is restored.