response.tryEnd doesn't copy the received buffer?

[uasan]

I noticed that tryEnd called on onWritable events does not copy the received buffer, i.e. If, after calling tryEnd, you write data to that part of the buffer that has already been sent, there is a chance that the client will receive changed data, because tryEnd did not copy the contents of the buffer.

[uasan]

Or the second assumption, the bufferOffset is not taken, i.e. you sometimes copy buffer from position zero

[uNetworkingAB]

You can see https://github.com/uNetworking/uWebSockets.js/blob/master/examples/VideoStreamer.js for an example on tryEnd

[uasan]

Yes, they use the slice method, it makes copies of bytes, I used method subarray, it does not copy bytes, I did not know that tryEnd does not copy the buffer, now I will know