ERR_HTTP2_PROTOCOL_ERROR message on multiple pages

duhon2kon

duhon2kon

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

@duhon2kon Opera One, Opera GX or Opera Air?

duhon2kon

duhon2kon @leocg

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

duhon2kon

duhon2kon

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