static void add_headers_unconditional(struct st_h2o_sendfile_generator_t *self, h2o_req_t *req)
{
/* RFC 7232 4.1: The server generating a 304 response MUST generate any of the following header fields that would have been sent
* in a 200 (OK) response to the same request: Cache-Control, Content-Location, Date, ETag, Expires, and Vary (snip) a sender
* SHOULD NOT generate representation metadata other than the above listed fields unless said metadata exists for the purpose of
* guiding cache updates. */
if (self->send_etag) {
size_t etag_len = h2o_filecache_get_etag(self->file.ref, self->header_bufs.etag);
h2o_add_header(&req->pool, &req->res.headers, H2O_TOKEN_ETAG, self->header_bufs.etag, etag_len);
}
if (self->send_vary)
h2o_set_header_token(&req->pool, &req->res.headers, H2O_TOKEN_VARY, H2O_STRLIT("accept-encoding"));
}
static void on_setup_ostream(h2o_filter_t *_self, h2o_req_t *req, h2o_ostream_t **slot)
{
struct st_compress_filter_t *self = (void *)_self;
struct st_compress_encoder_t *encoder;
int compressible_types;
h2o_compress_context_t *compressor;
ssize_t i;
if (req->version < 0x101)
goto Next;
if (req->res.status != 200)
goto Next;
if (h2o_memis(req->input.method.base, req->input.method.len, H2O_STRLIT("HEAD")))
goto Next;
if (req->res.mime_attr == NULL)
h2o_req_fill_mime_attributes(req);
if (!req->res.mime_attr->is_compressible)
goto Next;
if (req->res.content_length < self->args.min_size)
goto Next;
/* skip if failed to gather the list of compressible types */
if ((compressible_types = h2o_get_compressible_types(&req->headers)) == 0)
goto Next;
/* skip if content-encoding header is being set (as well as obtain the location of accept-ranges) */
size_t content_encoding_header_index = -1, accept_ranges_header_index = -1;
for (i = 0; i != req->res.headers.size; ++i) {
if (req->res.headers.entries[i].name == &H2O_TOKEN_CONTENT_ENCODING->buf)
content_encoding_header_index = i;
else if (req->res.headers.entries[i].name == &H2O_TOKEN_ACCEPT_RANGES->buf)
accept_ranges_header_index = i;
else
continue;
}
if (content_encoding_header_index != -1)
goto Next;
/* open the compressor */
#ifndef _MSC_VER
#else
#define H2O_USE_BROTLI 0
#endif
#if H2O_USE_BROTLI
if (self->args.brotli.quality != -1 && (compressible_types & H2O_COMPRESSIBLE_BROTLI) != 0) {
compressor = h2o_compress_brotli_open(&req->pool, self->args.brotli.quality, req->res.content_length);
} else
#endif
if (self->args.gzip.quality != -1 && (compressible_types & H2O_COMPRESSIBLE_GZIP) != 0) {
compressor = h2o_compress_gzip_open(&req->pool, self->args.gzip.quality);
} else {
goto Next;
}
/* adjust the response headers */
req->res.content_length = SIZE_MAX;
h2o_add_header(&req->pool, &req->res.headers, H2O_TOKEN_CONTENT_ENCODING, compressor->name.base, compressor->name.len);
h2o_set_header_token(&req->pool, &req->res.headers, H2O_TOKEN_VARY, H2O_STRLIT("accept-encoding"));
if (accept_ranges_header_index != -1) {
req->res.headers.entries[accept_ranges_header_index].value = h2o_iovec_init(H2O_STRLIT("none"));
} else {
h2o_add_header(&req->pool, &req->res.headers, H2O_TOKEN_ACCEPT_RANGES, H2O_STRLIT("none"));
}
/* setup filter */
encoder = (void *)h2o_add_ostream(req, sizeof(*encoder), slot);
encoder->super.do_send = do_send;
slot = &encoder->super.next;
encoder->compressor = compressor;
/* adjust preferred chunk size (compress by 8192 bytes) */
if (req->preferred_chunk_size > BUF_SIZE)
req->preferred_chunk_size = BUF_SIZE;
Next:
h2o_setup_next_ostream(req, slot);
}