hello,

I encountered a problem when I write a upstream module to process
data from my upstream server.
I set the header recv buffer to a small size that can not hold the
whole response header. While in my process_header handler of my
module, it will wait for the whole response header to process header,
then return NGX_AGAIN and leave data in u->buffer not processed(in
this case, u->buffer->pos < u->buffer->last). Then u->buffer->pos will
never equal to u->buffer->end, and nginx will nerver log "upstream
send too big header". This will cause nginx to call recv again with
zero buffer size.
I think this may be a problem, and I made a patch for that.

Thinks,
lizi
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