ERR_HTTP2_PROTOCOL_ERROR message on multiple pages

[duhon2kon]

duhon2kon last edited by leocg

I'm experiencing ERR_HTTP2_PROTOCOL_ERROR in Opera even in Incognito mode, with all extensions disabled and cache cleared. The issue occurs on multiple sites, not just one. Chrome handles the same requests fine, so it seems specific to Opera's HTTP/2 implementation or how certain servers interact with it.

[leocg]

leocg Moderator Volunteer @duhon2kon last edited by

@duhon2kon Opera One, Opera GX or Opera Air?

[duhon2kon]

duhon2kon @leocg last edited by

@leocg Opera One(version: 124.0.5705.42) (arm64) on MacOS

[duhon2kon]

duhon2kon last edited by

I have two logs of requests for Chrome and Opera.
Opera

t=2762687 [st=  7]         +UPLOAD_DATA_STREAM_READ  [dt=0]
                          --> current_position = 0
t=2762687 [st=  7]            UPLOAD_DATA_STREAM_READ  [dt=0]
                            --> current_position = 0
t=2762687 [st=  7]         -UPLOAD_DATA_STREAM_READ
t=2762687 [st=  7]          HTTP2_STREAM_UPDATE_SEND_WINDOW
                          --> delta = -81
                          --> stream_id = 3
                          --> window_size = 65454
t=2762687 [st=  7]       -HTTP_TRANSACTION_SEND_REQUEST
t=2762687 [st=  7]       +HTTP_TRANSACTION_READ_HEADERS  [dt=649]
t=2763336 [st=656]          HTTP2_STREAM_ERROR
                          --> description = "Server reset stream."
                          --> net_error = "ERR_HTTP2_PROTOCOL_ERROR"
                          --> stream_id = 3

Chrome

t=14431 [st=393]          UPLOAD_DATA_STREAM_READ  [dt=0]
                          --> current_position = 0
t=14431 [st=393]          HTTP2_STREAM_UPDATE_SEND_WINDOW
                          --> delta = -81
                          --> stream_id = 1
                          --> window_size = 65454
t=14432 [st=394]       -HTTP_TRANSACTION_SEND_REQUEST
t=14432 [st=394]       +HTTP_TRANSACTION_READ_HEADERS  [dt=490]
t=14475 [st=437]          HTTP2_STREAM_UPDATE_SEND_WINDOW
                          --> delta = 0
                          --> stream_id = 1
                          --> window_size = 65454
t=14922 [st=884]          HTTP_TRANSACTION_READ_RESPONSE_HEADERS
                          --> HTTP/1.1 200
                              content-type: application/json;charset=utf-8
                              vary: Accept-Encoding
                              x-content-type-options: nosniff
                              x-xss-protection: 1; mode=block
                              x-frame-options: SAMEORIGIN
                              x-request-id: ab7qdcfe86f64ad7ca704f0d8bb7c6ad
                              content-security-policy: default-src https: data: 'unsafe-inline' 'unsafe-eval'
                              x-response-status: 200
                              timezone: -5
                              access-control-allow-credentials: true
                              access-control-allow-methods: GET, POST, OPTIONS
                              content-encoding: br
                              content-length: 258
                              expires: Sun, 23 Nov 2025 20:12:16 GMT
                              cache-control: max-age=0, no-cache, no-store
                              pragma: no-cache
                              date: Sun, 23 Nov 2025 20:12:16 GMT
                              set-cookie: [89 bytes were stripped]
                              set-cookie: [209 bytes were stripped]
                              set-cookie: [24 bytes were stripped]
                              set-cookie: [1089 bytes were stripped]
                              set-cookie: [390 bytes were stripped]
                              set-cookie: [589 bytes were stripped]
                              access-control-allow-origin: https://www.lenovo.com
                              strict-transport-security: max-age=15768000 ; includeSubDomains ; preload
t=14922 [st=884]       -HTTP_TRANSACTION_READ_HEADERS

[duhon2kon]

duhon2kon last edited by

Today, I tried to make the request again, and there was no error. From observation (I’ve been watching this for a year), it appears that after the first requests with incorrect cookies or parameters, the site denies access and then blocks me for some time (regardless of whether I send correct data afterwards). This often happens during logins. But if this is a temporary site block, then I don’t understand why Chrome succeeds at the same moment on the same computer. I wrote on this forum because I don’t want to stop using Opera, but this strange behavior forces me to switch to Chrome. Any tips would be appreciated. I can investigate several factors to resolve this issue.