Safari 10.1: XMLHttpRequest with query parameters cannot load due to access control checks

Question

When trying a CORS request on Safari 10.1, on an URL which includes query parameters (e.g. https://example.com/api?v=1), Safari says

XMLHttpRequest cannot load due to access control checks

Chrome/Firefox works fine.

On requests from the page without the ?v=1, Safari works fine too.

I tried changing the server response header from

Access-Control-Allow-Origin: https://example.com

to

Access-Control-Allow-Origin: https://example.com/api?v=1

but that breaks Chrome.

Any suggestions?

Answer 1

You're running into CORS issues.

Some possible causes:

• The header Access-Control-Allow-Origin can only be set on server side, not in your clients script. (You did not make clear you did that correctly.)
• Are you sure the protocol (http vs https vs maybe even file) is exactly the same?
• If you may have multiple sub domains you need to setup your config (e.g. Apache) with something like "^http(s)?://(.+\.)?test\.com$ .
  The ^ marks the start of the line to prevent anything preceeding this url. You need a protocol and allowing both here. A subdomain is optional. And the $ marks the end of line (you don't need to set sub-pages, because origin is only host based).
• As stated here adding Access-Control-Allow-Headers: Origin to the server configuration as well may be a solution. Try to compare the actual requests made my Safari to the successfull requests done by Firefox or Chrome to spot possible missing Headers as well (and maybe compare them to your server configuration as well).

Answer 2

If anyone comes across this error, it just occurred in the application I was building. In my case, it turned out to be a trailing / in the uri, which caused a 301 response, which was for some reason interpreted by Safari as a 500 response.

Answer 3

Trying following might work -

Access-Control-Allow-Origin: <origin> | *