Describe the bug
Tested on site hosted within subdomain and subpath (demo.***.io/sample).
Newly setup site, Site Kit just added, API key is correct and no restrictions, copied as per setup process. PageSpeed services/module is appearing as "Connected" under 'connected services' tab in Site Kit Admin.
To Reproduce
Install Site Kit on subdomain & subpath.
![Screen Shot 2019-06-26 at 2 23 58 PM](https://user-images.githubusercontent.com/41326532/60183371-13caa800-981e-11e9-80fc-dae98368edc3.png)
![Screen Shot 2019-06-26 at 2 25 09 PM](https://user-images.githubusercontent.com/41326532/60183462-4aa0be00-981e-11e9-9e86-3fd4b8d1328d.png)
pagespeed-insights::site-pagespeed-desktop::last-28-days::d41d8cd98f00b204e9800998ecf8427e: {errors: {400: ["Bad Request"]}, error_data: {400: {status: 500, reason: "keyInvalid"}}}
error_data: {400: {status: 500, reason: "keyInvalid"}}
errors: {400: ["Bad Request"]}
pagespeed-insights::site-pagespeed-mobile::last-28-days::d41d8cd98f00b204e9800998ecf8427e: {errors: {400: ["Bad Request"]}, error_data: {400: {status: 500, reason: "keyInvalid"}}}
error_data: {400: {status: 500, reason: "keyInvalid"}}
errors: {400: ["Bad Request"]}
Response:
{"pagespeed-insights::site-pagespeed-mobile::last-28-days::d41d8cd98f00b204e9800998ecf8427e":{"errors":{"400":["Bad Request"]},"error_data":{"400":{"status":500,"reason":"keyInvalid"}}},"pagespeed-insights::site-pagespeed-desktop::last-28-days::d41d8cd98f00b204e9800998ecf8427e":{"errors":{"400":["Bad Request"]},"error_data":{"400":{"status":500,"reason":"keyInvalid"}}}}
System Information (please complete the following information):
WordPress Version: 5.2.2
Web Host OS: Linux
Site Kit Plugin version: 1.0.0-beta.1
Browser: Chrome
Operating System: Macos 10.13.6
PHP Version: 7.2