I'm having the same issue :-(

I was running an Rstudio version of 2024, and tried updating to 2025.05.1 but still get the issue. It also started a week ago or so. It's probably a problem on the side of copilot or github and not RStudio version.

In my Rstudio logs ("Help/Diagnostics/Show log files"), I see at the end of the log file some line

"2025-08-26T07:28:47.612812Z [rsession-jracle] ERROR [onStdout]: Internal error: response contains no Content-Length header.; LOGGED FROM: void __cdecl rstudio::session::modules::copilot::`anonymous-namespace'::agent::onStdout(class rstudio::core::system::ProcessOperations &,const class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > &) C:\Users\jenkins\workspace\ide-os-windows\rel-mariposa-orchid\src\cpp\session\modules\SessionCopilot.cpp:823

Which I don't really understand. My user id is jracle, and I don't have any C:\Users\jenkins user or folder on my computer, maybe this is the issue?

Thanks. Best regards,

Julien