![]() This policy exists because it is too easy to inject a link to a javascript file that is on a different domain. It would prevent different origins from interacting with each other through such requests, like AJAX. ![]() In other words, the browser would not allow any site to make a request to any other site. The Same Origin Policy (SOP) is the policy browsers implement to prevent vulnerabilities via Cross Site Scripting (XSS). Note: This looks like the code in the api for the access control headers.Ĭross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at I’m thinking that either the API recommended practices page is no longer correct and needs changing, or the User-Agent header should be included in Access-Control-Allow-Headers returned from the api. I can post the full html + js if you need. Step 4: see the error appear in the console Step 3: Open the page in Firefox, open dev tools (F12) to the console, then click the button Step 2: onclick of the button execute the following javascript function: async function testUserAgent() Step 1: Create simple html page with a button Removing the User-Agent header allows it to work in Firefox. This worked so far in Chrome, but trying it out in Firefox - it hits an error during the pre-flight request which complains that Access-Control-Allow-Headers does not allow User-Agent. I followed the advice on that page to include a custom User-Agent header in all requests. I’ve started making a web app that interacts with the iNaturalist API directly through javascript in the browser, and I’ve been trying to follow the advice on the API recommended practices page. (Reason: header ‘user-agent’ is not allowed according to header ‘Access-Control-Allow-Headers’ from CORS preflight response). Screenshots of what you are seeing: Not a screenshot, but here’s a log message:Ĭross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at. URLs of any relevant observations or pages: any v1 api request.
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