A way to add a connection upgrade header in http2https plugin

[Nuckerr]

Describe the feature request

A way to add the "Connection" and "Upgrade" header to frp.

Describe alternatives you've considered

No response

Affected area

• [ ] Docs
• [ ] Installation
• [ ] Performance and Scalability
• [ ] Security
• [ ] User Experience
• [ ] Test and Release
• [ ] Developer Infrastructure
• [X] Client Plugin
• [ ] Server Plugin
• [X] Extensions
• [ ] Others

[fatedier]

Can you describe more about this issue?

[Nuckerr]

In the http2https plugin, I want to be able to add the "Connection" and "Upgrade" headers so they are sent when anyone goes to a website proxied by frp. This is because some applications rely on this.

[fatedier]

We can support it in frp v2 in a general way.