Access to pexels fails on Safari and Firefox

[bskrypnyk]

Hello.

We are successfully using pexels js library in Chrome. However, when used in Safari - both desktop and mobile, and Firefox, the request fails with these messages in the console:

"Failed to load resource: Request header field User-Agent is not allowed by Access-Control-Allow-Headers."

We are running the latest 1.4.0 version of the library.

[HeikoTheissen]

The behavior is explained here.

The usage of a special User-Agent header by the Pexels client library does not fit to the fact that the Pexels server does not accept this as a CORS-unsafe header in cross-origin requests.