method might not refer to a location within buffer about httparse HOT 2 CLOSED

Following up on this. I came up with three possible solutions:

• Parse the request twice, once before reading the body and once after. This is likely the simplest approach.

• Keep doing the slice->index conversion thing we were doing, but take into account that a slice might not be in the buffer. Each tracked field could be an enum, something like enum FieldRef { RangeInBuf(u32, u32), Slice(&'static str) }. This is likely the closest solution to what we were already doing.

• Use a different buffer for subsequent reads. After parsing the request, copy any remaining bytes into a second buffer, and then start using that second buffer for reading the body. The original buffer stays borrowed by the Request. Further, when it's time to read the next request, read it from the second buffer. This is likely the most optimal solution, if there happens to be an unused buffer lying around. In our case we did have this: an idle write buffer.

I ended up going with the last approach. For each connection we were allocating two Vec<u8> buffers, one for reading and one for writing, but the write buffer was not used at all during the reading process and so it was available. The implementation was a bit tricky, with the buffers switching places for each request, but it seems to work.

from httparse.