Without reading the whole file, what is the best approach to only check
if the beginning of the file contains a specific character?
Would something like this be the right approach?
b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t));
b->file = ngx_pcalloc(r->pool, sizeof(ngx_file_t));
then set file_pos, file_last etc.
and later do ngx_cpymem(s, b->pos, size) to copy it in a u_char and then
do a if s == ?