The ":path" header field will be used a lot with outgoing requests,
let's encode it with its index.
out->area[len++] = 0x61; // literal with indexing -- name="date" (idx 33)
else if (isteq(n, ist("etag")))
out->area[len++] = 0x62; // literal with indexing -- name="etag" (idx 34)
+ else if (isteq(n, ist(":path")))
+ out->area[len++] = 0x44; // literal with indexing -- name=":path" (idx 4)
else if (isteq(n, ist("server")))
out->area[len++] = 0x76; // literal with indexing -- name="server" (idx 54)
else if (isteq(n, ist("location")))