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MINOR: hpack: optimize header encoding for short names

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For unknown fields, since we know that most of them are less than 127
characters, we don't need to go through the loop and can instead directly
emit the one-byte length encoding. This increases the request rate by
approximately 0.5%.
This commit is contained in:
Willy Tarreau 2018-12-11 06:42:01 +01:00
parent ac73ae0b83
commit 19ed92b47d
1 changed files with 6 additions and 0 deletions
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6
src/hpack-enc.c
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@ -114,6 +114,12 @@ int hpack_encode_header(struct buffer *out, const struct ist n,
out->area[len++] = 0x58; // literal with indexing -- name="cache-control" (idx 24)
else if (isteq(n, ist("content-length")))
out->area[len++] = 0x5c; // literal with indexing -- name="content-length" (idx 28)
else if (likely(n.len < 127 && len + 1 + n.len <= size)) {
out->area[len++] = 0x00; /* literal without indexing -- new name */
out->area[len++] = n.len; /* single-byte length encoding */
ist2bin(out->area + len, n);
len += n.len;
}
else if (len_to_bytes(n.len) && len + 1 + len_to_bytes(n.len) + n.len <= size) {
out->area[len++] = 0x00; /* literal without indexing -- new name */
len = hpack_encode_len(out->area, len, n.len);