Even if the error is triggering on each page having a HTTP header 200, those pages are always loading on client's browser, but sometimes an element is missing (in my exemple, the external Twitter feed). error pops no matter what PHP version is used, from 5.6 to 7.3 (framework used : Cakephp 2.10)Īs requested, below is the returned header for the failing ressource, which is the whole web page.error pops on a different server (both are OVH's), which uses a different certificate.error doesn't pop on local with a HTTPS certificate.error doesn't pop on the exact same page if server returns 404 instead of 2XX.Might be related to Website OK on Firefox but not on Safari (kCFErrorDomainCFNetwork error 303) neither Chrome (net::ERR_SPDY_PROTOCOL_ERROR)įindings from further investigations are the following: Moreover, I noticed it appears on very recent Google Chrome releases the error doesn't pop on v.64.X, but it does on v.75+ (regardless of the OS I'm working on Mac tho). Thing is the error isn't documented at all.

I was wondering if it could be related to the header returned by the server since there is this '200' mention in the error, and a 404 / 500 page isn't triggering anything. (NB: I tried with Safari, and I have a similar kcferrordomaincfnetwork 303 error) Google Chrome is the only web browser triggering the error: it works well on both Edge and Firefox. If I access the website in HTTP, the Twitter feed appears and the error disappears If I remove the code to load the Twitter feed, the error remains I can notice in the console the ERR_HTTP2_PROTOCOL_ERROR My Twitter feed integrated via isn't loaded at all I can't be 100% sure it is related, but it looks like it prevents JavaScript to be executed properly.įor instance, the following scenario happens :

I'm not sure exactly what can provoke this error, I just noticed it pops out only when accessing the website in HTTPS.

I'm currently working on a website, which triggers a net::ERR_HTTP2_PROTOCOL_ERROR 200 error on Google Chrome.

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