This particular script found at https://github.com/shutterstock/api/blob/master/examples/javascript-jquery/v2.html is a front-end solution that directly interacts with the ShutterStock api. It does not utilize a proxy server, and JSONP or CORS are also not employed (since both the Access-Control-Allow-Origin in the response header and Origin in the request header are null). How is this functionality achieved without those components?
The response header's Access-Control-Allow-Origin and the request header's Origin are both null.
This situation involves CORS.
According to the browser, the origin is null, which suggests that the HTML document is being loaded from a file: scheme URI rather than an HTTP URI. However, the server allows the null origin to access the data.
The server's API responds by dynamically configuring the Access-Control-Allow-Origin header to match the origin specified in the request header.
Example Command:
curl 'https://api.shutterstock.com/v2/images/search' -H 'Origin: http://example.com' --compressed -vHere is a trimmed excerpt from the output:
...
> GET /v2/images/search HTTP/1.1
...
> Host: api.shutterstock.com
> Origin: http://example.com
>
< HTTP/1.1 401 Unauthorized
< Access-Control-Allow-Origin: http://example.com
...
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