stoplightio
CORS preflight calls are slowing down pages
User story.
When using 'elements-dev'portal", besides the high response times (over 200ms measured at 2 location) for all requests, there is an additional request for CORS preflight. The CORS preflight request was measured at 185-215ms (at 2 locations). That adds up to at least over 400ms to get any data from the Stoplight servers. Ex:
Is that by design? I don't know. Can you get rid of those CORS preflight requests? yes. The reason they are generated by the browser is explained here: https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS#preflighted_requests
I did make a local copy of web-components.min.js, and removed the stoplight-elements-version from the request. The result is no more CORS preflight requests, and I shaved 200ms off, as you can see in the screenshot:
Is your feature request related to a problem?
Yes. Pages load visibly too long. Clicking on any endpoint contract, takes painfully long to render. This is a quick win to get those response times lower.
Describe the solution you'd like
The solution is up to you, but if you really need that stoplight-elements-version header in the request, you could put it as query parameter in the url.
Hey team! Please add your planning poker estimate with ZenHub @mallachari @mmiask @mpodlasin @Nezteb @paulatulis @wmhilton @domagojk
