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/usr/include/h2o/http1.h is in libh2o-dev-common 2.2.4+dfsg-1build1.

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/*
 * Copyright (c) 2014 DeNA Co., Ltd.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */
#ifndef h2o__http1_h
#define h2o__http1_h

#ifdef __cplusplus
extern "C" {
#endif

typedef void (*h2o_http1_upgrade_cb)(void *user_data, h2o_socket_t *sock, size_t reqsize);

extern const h2o_protocol_callbacks_t H2O_HTTP1_CALLBACKS;

void h2o_http1_accept(h2o_accept_ctx_t *ctx, h2o_socket_t *sock, struct timeval connected_at);
void h2o_http1_upgrade(h2o_req_t *req, h2o_iovec_t *inbufs, size_t inbufcnt, h2o_http1_upgrade_cb on_complete, void *user_data);

#ifdef __cplusplus
}
#endif

#endif