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< h1 > asio_http2.h< a class = "headerlink" href = "#asio-http2-h" title = "Permalink to this headline" > ¶< / a > < / h1 >
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< div class = "highlight-cpp" > < div class = "highlight" > < pre > < span class = "cm" > /*< / span >
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< span class = "cm" > * nghttp2 - HTTP/2 C Library< / span >
< span class = "cm" > *< / span >
< span class = "cm" > * Copyright (c) 2014 Tatsuhiro Tsujikawa< / span >
< span class = "cm" > *< / span >
< span class = "cm" > * Permission is hereby granted, free of charge, to any person obtaining< / span >
< span class = "cm" > * a copy of this software and associated documentation files (the< / span >
< span class = "cm" > * " Software" ), to deal in the Software without restriction, including< / span >
< span class = "cm" > * without limitation the rights to use, copy, modify, merge, publish,< / span >
< span class = "cm" > * distribute, sublicense, and/or sell copies of the Software, and to< / span >
< span class = "cm" > * permit persons to whom the Software is furnished to do so, subject to< / span >
< span class = "cm" > * the following conditions:< / span >
< span class = "cm" > *< / span >
< span class = "cm" > * The above copyright notice and this permission notice shall be< / span >
< span class = "cm" > * included in all copies or substantial portions of the Software.< / span >
< span class = "cm" > *< / span >
< span class = "cm" > * THE SOFTWARE IS PROVIDED " AS IS" , WITHOUT WARRANTY OF ANY KIND,< / span >
< span class = "cm" > * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF< / span >
< span class = "cm" > * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND< / span >
< span class = "cm" > * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE< / span >
< span class = "cm" > * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION< / span >
< span class = "cm" > * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION< / span >
< span class = "cm" > * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.< / span >
< span class = "cm" > */< / span >
< span class = "cp" > #ifndef ASIO_HTTP2_H< / span >
< span class = "cp" > #define ASIO_HTTP2_H< / span >
< span class = "cp" > #include < cstdint> < / span >
< span class = "cp" > #include < memory> < / span >
< span class = "cp" > #include < string> < / span >
< span class = "cp" > #include < vector> < / span >
< span class = "cp" > #include < functional> < / span >
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< span class = "k" > namespace< / span > < span class = "n" > nghttp2< / span > < span class = "p" > {< / span >
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< span class = "k" > namespace< / span > < span class = "n" > asio_http2< / span > < span class = "p" > {< / span >
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< span class = "k" > struct< / span > < span class = "n" > header< / span > < span class = "p" > {< / span >
< span class = "n" > std< / span > < span class = "o" > ::< / span > < span class = "n" > string< / span > < span class = "n" > name< / span > < span class = "p" > ;< / span >
< span class = "n" > std< / span > < span class = "o" > ::< / span > < span class = "n" > string< / span > < span class = "n" > value< / span > < span class = "p" > ;< / span >
< span class = "p" > };< / span >
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< span class = "k" > typedef< / span > < span class = "n" > std< / span > < span class = "o" > ::< / span > < span class = "n" > function< / span > < span class = "o" > < < / span > < span class = "kt" > void< / span > < span class = "p" > (< / span > < span class = "k" > const< / span > < span class = "kt" > uint8_t< / span > < span class = "o" > *< / span > < span class = "p" > ,< / span > < span class = "n" > std< / span > < span class = "o" > ::< / span > < span class = "kt" > size_t< / span > < span class = "p" > )< / span > < span class = "o" > > < / span > < span class = "n" > data_cb< / span > < span class = "p" > ;< / span >
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< span class = "k" > typedef< / span > < span class = "n" > std< / span > < span class = "o" > ::< / span > < span class = "n" > function< / span > < span class = "o" > < < / span > < span class = "kt" > void< / span > < span class = "p" > (< / span > < span class = "kt" > void< / span > < span class = "p" > )< / span > < span class = "o" > > < / span > < span class = "n" > void_cb< / span > < span class = "p" > ;< / span >
< span class = "c1" > // Callback function to generate response body. The implementation of< / span >
< span class = "c1" > // this callback must fill at most |len| bytes data to |buf|. The< / span >
< span class = "c1" > // return value is pair of written bytes and bool value indicating< / span >
< span class = "c1" > // that this is the end of the body. If the end of the body was< / span >
< span class = "c1" > // reached, return true. If there is error and application wants to< / span >
< span class = "c1" > // terminate stream, return std::make_pair(-1, false). Returning< / span >
< span class = "c1" > // std::make_pair(0, false) tells the library that don' t call this< / span >
< span class = "c1" > // callback until application calls response::resume(). This is< / span >
< span class = "c1" > // useful when there is no data to send at the moment but there will< / span >
< span class = "c1" > // be more to come in near future.< / span >
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< span class = "k" > typedef< / span > < span class = "n" > std< / span > < span class = "o" > ::< / span > < span class = "n" > function< / span > < span class = "o" > < < / span > < span class = "n" > std< / span > < span class = "o" > ::< / span > < span class = "n" > pair< / span > < span class = "o" > < < / span > < span class = "kt" > ssize_t< / span > < span class = "p" > ,< / span > < span class = "kt" > bool< / span > < span class = "o" > > < / span > < span class = "p" > (< / span > < span class = "kt" > uint8_t< / span > < span class = "o" > *< / span > < span class = "n" > buf< / span > < span class = "p" > ,< / span > < span class = "n" > std< / span > < span class = "o" > ::< / span > < span class = "kt" > size_t< / span > < span class = "n" > len< / span > < span class = "p" > )< / span > < span class = "o" > > < / span >
< span class = "n" > read_cb< / span > < span class = "p" > ;< / span >
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< span class = "k" > class< / span > < span class = "nc" > channel_impl< / span > < span class = "p" > ;< / span >
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< span class = "k" > class< / span > < span class = "nc" > channel< / span > < span class = "p" > {< / span >
< span class = "k" > public< / span > < span class = "o" > :< / span >
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< span class = "c1" > // Application must not call this directly.< / span >
< span class = "n" > channel< / span > < span class = "p" > ();< / span >
< span class = "c1" > // Schedules the execution of callback |cb| in the same thread where< / span >
< span class = "c1" > // request callback is called. Therefore, it is same to use request< / span >
< span class = "c1" > // or response object in |cb|. The callbacks are executed in the< / span >
< span class = "c1" > // same order they are posted though same channel object if they are< / span >
< span class = "c1" > // posted from the same thread.< / span >
< span class = "kt" > void< / span > < span class = "nf" > post< / span > < span class = "p" > (< / span > < span class = "n" > void_cb< / span > < span class = "n" > cb< / span > < span class = "p" > );< / span >
< span class = "c1" > // Application must not call this directly.< / span >
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< span class = "n" > channel_impl< / span > < span class = "o" > & < / span > < span class = "n" > impl< / span > < span class = "p" > ();< / span >
< span class = "k" > private< / span > < span class = "o" > :< / span >
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< span class = "n" > std< / span > < span class = "o" > ::< / span > < span class = "n" > unique_ptr< / span > < span class = "o" > < < / span > < span class = "n" > channel_impl< / span > < span class = "o" > > < / span > < span class = "n" > impl_< / span > < span class = "p" > ;< / span >
< span class = "p" > };< / span >
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< span class = "k" > typedef< / span > < span class = "n" > std< / span > < span class = "o" > ::< / span > < span class = "n" > function< / span > < span class = "o" > < < / span > < span class = "kt" > void< / span > < span class = "p" > (< / span > < span class = "n" > channel< / span > < span class = "o" > & < / span > < span class = "p" > )< / span > < span class = "o" > > < / span > < span class = "n" > thread_cb< / span > < span class = "p" > ;< / span >
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< span class = "k" > namespace< / span > < span class = "n" > server< / span > < span class = "p" > {< / span >
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< span class = "k" > class< / span > < span class = "nc" > request_impl< / span > < span class = "p" > ;< / span >
< span class = "k" > class< / span > < span class = "nc" > response_impl< / span > < span class = "p" > ;< / span >
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< span class = "k" > class< / span > < span class = "nc" > request< / span > < span class = "p" > {< / span >
< span class = "k" > public< / span > < span class = "o" > :< / span >
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< span class = "c1" > // Application must not call this directly.< / span >
< span class = "n" > request< / span > < span class = "p" > ();< / span >
< span class = "c1" > // Returns request headers. The pusedo headers, which start with< / span >
< span class = "c1" > // colon (;), are exluced from this list.< / span >
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< span class = "k" > const< / span > < span class = "n" > std< / span > < span class = "o" > ::< / span > < span class = "n" > vector< / span > < span class = "o" > < < / span > < span class = "n" > header< / span > < span class = "o" > > < / span > < span class = "o" > & < / span > < span class = "n" > headers< / span > < span class = "p" > ()< / span > < span class = "k" > const< / span > < span class = "p" > ;< / span >
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< span class = "c1" > // Returns method (e.g., GET).< / span >
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< span class = "k" > const< / span > < span class = "n" > std< / span > < span class = "o" > ::< / span > < span class = "n" > string< / span > < span class = "o" > & < / span > < span class = "n" > method< / span > < span class = "p" > ()< / span > < span class = "k" > const< / span > < span class = "p" > ;< / span >
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< span class = "c1" > // Returns scheme (e.g., https).< / span >
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< span class = "k" > const< / span > < span class = "n" > std< / span > < span class = "o" > ::< / span > < span class = "n" > string< / span > < span class = "o" > & < / span > < span class = "n" > scheme< / span > < span class = "p" > ()< / span > < span class = "k" > const< / span > < span class = "p" > ;< / span >
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< span class = "c1" > // Returns authority (e.g., example.org). This could be empty< / span >
< span class = "c1" > // string. In this case, check host().< / span >
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< span class = "k" > const< / span > < span class = "n" > std< / span > < span class = "o" > ::< / span > < span class = "n" > string< / span > < span class = "o" > & < / span > < span class = "n" > authority< / span > < span class = "p" > ()< / span > < span class = "k" > const< / span > < span class = "p" > ;< / span >
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< span class = "c1" > // Returns host (e.g., example.org). If host header field is not< / span >
< span class = "c1" > // present, this value is copied from authority().< / span >
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< span class = "k" > const< / span > < span class = "n" > std< / span > < span class = "o" > ::< / span > < span class = "n" > string< / span > < span class = "o" > & < / span > < span class = "n" > host< / span > < span class = "p" > ()< / span > < span class = "k" > const< / span > < span class = "p" > ;< / span >
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< span class = "c1" > // Returns path (e.g., /index.html).< / span >
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< span class = "k" > const< / span > < span class = "n" > std< / span > < span class = "o" > ::< / span > < span class = "n" > string< / span > < span class = "o" > & < / span > < span class = "n" > path< / span > < span class = "p" > ()< / span > < span class = "k" > const< / span > < span class = "p" > ;< / span >
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< span class = "c1" > // Sets callback when chunk of request body is received.< / span >
< span class = "kt" > void< / span > < span class = "nf" > on_data< / span > < span class = "p" > (< / span > < span class = "n" > data_cb< / span > < span class = "n" > cb< / span > < span class = "p" > );< / span >
< span class = "c1" > // Sets callback when request was completed.< / span >
< span class = "kt" > void< / span > < span class = "nf" > on_end< / span > < span class = "p" > (< / span > < span class = "n" > void_cb< / span > < span class = "n" > cb< / span > < span class = "p" > );< / span >
< span class = "c1" > // Pushes resource denoted by |path| using |method|. The additional< / span >
< span class = "c1" > // headers can be given in |headers|. request_cb will be called for< / span >
< span class = "c1" > // pushed resource later on. This function returns true if it< / span >
< span class = "c1" > // succeeds, or false.< / span >
< span class = "kt" > bool< / span > < span class = "nf" > push< / span > < span class = "p" > (< / span > < span class = "n" > std< / span > < span class = "o" > ::< / span > < span class = "n" > string< / span > < span class = "n" > method< / span > < span class = "p" > ,< / span > < span class = "n" > std< / span > < span class = "o" > ::< / span > < span class = "n" > string< / span > < span class = "n" > path< / span > < span class = "p" > ,< / span >
< span class = "n" > std< / span > < span class = "o" > ::< / span > < span class = "n" > vector< / span > < span class = "o" > < < / span > < span class = "n" > header< / span > < span class = "o" > > < / span > < span class = "n" > headers< / span > < span class = "o" > =< / span > < span class = "p" > {});< / span >
< span class = "c1" > // Returns true if this is pushed request.< / span >
< span class = "kt" > bool< / span > < span class = "n" > pushed< / span > < span class = "p" > ()< / span > < span class = "k" > const< / span > < span class = "p" > ;< / span >
< span class = "c1" > // Returns true if stream has been closed.< / span >
< span class = "kt" > bool< / span > < span class = "n" > closed< / span > < span class = "p" > ()< / span > < span class = "k" > const< / span > < span class = "p" > ;< / span >
< span class = "c1" > // Runs function |start| in one of background threads. Returns true< / span >
< span class = "c1" > // if scheduling task was done successfully.< / span >
< span class = "c1" > //< / span >
< span class = "c1" > // Since |start| is called in different thread, calling any method< / span >
< span class = "c1" > // of request or response object in the callback may cause undefined< / span >
< span class = "c1" > // behavior. To safely use them, use channel::post(). A callback< / span >
< span class = "c1" > // passed to channel::post() is executed in the same thread where< / span >
< span class = "c1" > // request callback is called, so it is safe to use request or< / span >
< span class = "c1" > // response object. Example::< / span >
< span class = "kt" > bool< / span > < span class = "nf" > run_task< / span > < span class = "p" > (< / span > < span class = "n" > thread_cb< / span > < span class = "n" > start< / span > < span class = "p" > );< / span >
< span class = "c1" > // Application must not call this directly.< / span >
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< span class = "n" > request_impl< / span > < span class = "o" > & < / span > < span class = "n" > impl< / span > < span class = "p" > ();< / span >
< span class = "k" > private< / span > < span class = "o" > :< / span >
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< span class = "n" > std< / span > < span class = "o" > ::< / span > < span class = "n" > unique_ptr< / span > < span class = "o" > < < / span > < span class = "n" > request_impl< / span > < span class = "o" > > < / span > < span class = "n" > impl_< / span > < span class = "p" > ;< / span >
< span class = "p" > };< / span >
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< span class = "k" > class< / span > < span class = "nc" > response< / span > < span class = "p" > {< / span >
< span class = "k" > public< / span > < span class = "o" > :< / span >
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< span class = "c1" > // Application must not call this directly.< / span >
< span class = "n" > response< / span > < span class = "p" > ();< / span >
< span class = "c1" > // Write response header using |status_code| (e.g., 200) and< / span >
< span class = "c1" > // additional headers in |headers|.< / span >
< span class = "kt" > void< / span > < span class = "nf" > write_head< / span > < span class = "p" > (< / span > < span class = "kt" > unsigned< / span > < span class = "kt" > int< / span > < span class = "n" > status_code< / span > < span class = "p" > ,< / span > < span class = "n" > std< / span > < span class = "o" > ::< / span > < span class = "n" > vector< / span > < span class = "o" > < < / span > < span class = "n" > header< / span > < span class = "o" > > < / span > < span class = "n" > headers< / span > < span class = "o" > =< / span > < span class = "p" > {});< / span >
< span class = "c1" > // Sends |data| as request body. No further call of end() is< / span >
< span class = "c1" > // allowed.< / span >
< span class = "kt" > void< / span > < span class = "nf" > end< / span > < span class = "p" > (< / span > < span class = "n" > std< / span > < span class = "o" > ::< / span > < span class = "n" > string< / span > < span class = "n" > data< / span > < span class = "o" > =< / span > < span class = "s" > " " < / span > < span class = "p" > );< / span >
< span class = "c1" > // Sets callback |cb| as a generator of the response body. No< / span >
< span class = "c1" > // further call of end() is allowed.< / span >
< span class = "kt" > void< / span > < span class = "nf" > end< / span > < span class = "p" > (< / span > < span class = "n" > read_cb< / span > < span class = "n" > cb< / span > < span class = "p" > );< / span >
< span class = "c1" > // Resumes deferred response.< / span >
< span class = "kt" > void< / span > < span class = "nf" > resume< / span > < span class = "p" > ();< / span >
< span class = "c1" > // Returns status code.< / span >
< span class = "kt" > unsigned< / span > < span class = "kt" > int< / span > < span class = "n" > status_code< / span > < span class = "p" > ()< / span > < span class = "k" > const< / span > < span class = "p" > ;< / span >
< span class = "c1" > // Returns true if response has been started.< / span >
< span class = "kt" > bool< / span > < span class = "n" > started< / span > < span class = "p" > ()< / span > < span class = "k" > const< / span > < span class = "p" > ;< / span >
< span class = "c1" > // Application must not call this directly.< / span >
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< span class = "n" > response_impl< / span > < span class = "o" > & < / span > < span class = "n" > impl< / span > < span class = "p" > ();< / span >
< span class = "k" > private< / span > < span class = "o" > :< / span >
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< span class = "n" > std< / span > < span class = "o" > ::< / span > < span class = "n" > unique_ptr< / span > < span class = "o" > < < / span > < span class = "n" > response_impl< / span > < span class = "o" > > < / span > < span class = "n" > impl_< / span > < span class = "p" > ;< / span >
< span class = "p" > };< / span >
< span class = "c1" > // This is so called request callback. Called every time request is< / span >
< span class = "c1" > // received.< / span >
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< span class = "k" > typedef< / span > < span class = "n" > std< / span > < span class = "o" > ::< / span > < span class = "n" > function< / span > < span class = "o" > < < / span > < span class = "kt" > void< / span > < span class = "p" > (< / span > < span class = "k" > const< / span > < span class = "n" > std< / span > < span class = "o" > ::< / span > < span class = "n" > shared_ptr< / span > < span class = "o" > < < / span > < span class = "n" > request< / span > < span class = "o" > > < / span > < span class = "o" > & < / span > < span class = "p" > ,< / span >
< span class = "k" > const< / span > < span class = "n" > std< / span > < span class = "o" > ::< / span > < span class = "n" > shared_ptr< / span > < span class = "o" > < < / span > < span class = "n" > response< / span > < span class = "o" > > < / span > < span class = "o" > & < / span > < span class = "p" > )< / span > < span class = "o" > > < / span > < span class = "n" > request_cb< / span > < span class = "p" > ;< / span >
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< span class = "k" > class< / span > < span class = "nc" > http2_impl< / span > < span class = "p" > ;< / span >
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< span class = "k" > class< / span > < span class = "nc" > http2< / span > < span class = "p" > {< / span >
< span class = "k" > public< / span > < span class = "o" > :< / span >
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< span class = "n" > http2< / span > < span class = "p" > ();< / span >
< span class = "o" > ~< / span > < span class = "n" > http2< / span > < span class = "p" > ();< / span >
< span class = "c1" > // Starts listening connection on given address and port. The< / span >
< span class = "c1" > // incoming requests are handled by given callback |cb|.< / span >
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< span class = "kt" > void< / span > < span class = "nf" > listen< / span > < span class = "p" > (< / span > < span class = "k" > const< / span > < span class = "n" > std< / span > < span class = "o" > ::< / span > < span class = "n" > string< / span > < span class = "o" > & < / span > < span class = "n" > address< / span > < span class = "p" > ,< / span > < span class = "kt" > uint16_t< / span > < span class = "n" > port< / span > < span class = "p" > ,< / span > < span class = "n" > request_cb< / span > < span class = "n" > cb< / span > < span class = "p" > );< / span >
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< span class = "c1" > // Sets number of native threads to handle incoming HTTP request.< / span >
< span class = "c1" > // It defaults to 1.< / span >
< span class = "kt" > void< / span > < span class = "nf" > num_threads< / span > < span class = "p" > (< / span > < span class = "kt" > size_t< / span > < span class = "n" > num_threads< / span > < span class = "p" > );< / span >
< span class = "c1" > // Sets TLS private key file and certificate file. Both files must< / span >
< span class = "c1" > // be in PEM format.< / span >
< span class = "kt" > void< / span > < span class = "nf" > tls< / span > < span class = "p" > (< / span > < span class = "n" > std< / span > < span class = "o" > ::< / span > < span class = "n" > string< / span > < span class = "n" > private_key_file< / span > < span class = "p" > ,< / span > < span class = "n" > std< / span > < span class = "o" > ::< / span > < span class = "n" > string< / span > < span class = "n" > certificate_file< / span > < span class = "p" > );< / span >
< span class = "c1" > // Sets number of background threads to run concurrent tasks (see< / span >
< span class = "c1" > // request::run_task()). It defaults to 1. This is not the number< / span >
< span class = "c1" > // of thread to handle incoming HTTP request. For this purpose, see< / span >
< span class = "c1" > // num_threads().< / span >
< span class = "kt" > void< / span > < span class = "nf" > num_concurrent_tasks< / span > < span class = "p" > (< / span > < span class = "kt" > size_t< / span > < span class = "n" > num_concurrent_tasks< / span > < span class = "p" > );< / span >
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< span class = "c1" > // Sets the maximum length to which the queue of pending< / span >
< span class = "c1" > // connections.< / span >
< span class = "kt" > void< / span > < span class = "nf" > backlog< / span > < span class = "p" > (< / span > < span class = "kt" > int< / span > < span class = "n" > backlog< / span > < span class = "p" > );< / span >
< span class = "k" > private< / span > < span class = "o" > :< / span >
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< span class = "n" > std< / span > < span class = "o" > ::< / span > < span class = "n" > unique_ptr< / span > < span class = "o" > < < / span > < span class = "n" > http2_impl< / span > < span class = "o" > > < / span > < span class = "n" > impl_< / span > < span class = "p" > ;< / span >
< span class = "p" > };< / span >
< span class = "p" > }< / span > < span class = "c1" > // namespace server< / span >
< span class = "c1" > // Convenient function to create function to read file denoted by< / span >
< span class = "c1" > // |path|. This can be passed to response::end().< / span >
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< span class = "n" > read_cb< / span > < span class = "n" > file_reader< / span > < span class = "p" > (< / span > < span class = "k" > const< / span > < span class = "n" > std< / span > < span class = "o" > ::< / span > < span class = "n" > string< / span > < span class = "o" > & < / span > < span class = "n" > path< / span > < span class = "p" > );< / span >
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< span class = "c1" > // Like file_reader(const std::string& ), but it takes opened file< / span >
< span class = "c1" > // descriptor. The passed descriptor will be closed when returned< / span >
< span class = "c1" > // function object is destroyed.< / span >
< span class = "n" > read_cb< / span > < span class = "nf" > file_reader_from_fd< / span > < span class = "p" > (< / span > < span class = "kt" > int< / span > < span class = "n" > fd< / span > < span class = "p" > );< / span >
< span class = "c1" > // Validates path so that it does not contain directory traversal< / span >
< span class = "c1" > // vector. Returns true if path is safe. The |path| must start with< / span >
< span class = "c1" > // " /" otherwise returns false. This function should be called after< / span >
< span class = "c1" > // percent-decode was performed.< / span >
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< span class = "kt" > bool< / span > < span class = "nf" > check_path< / span > < span class = "p" > (< / span > < span class = "k" > const< / span > < span class = "n" > std< / span > < span class = "o" > ::< / span > < span class = "n" > string< / span > < span class = "o" > & < / span > < span class = "n" > path< / span > < span class = "p" > );< / span >
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< span class = "c1" > // Performs percent-decode against string |s|.< / span >
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< span class = "n" > std< / span > < span class = "o" > ::< / span > < span class = "n" > string< / span > < span class = "n" > percent_decode< / span > < span class = "p" > (< / span > < span class = "k" > const< / span > < span class = "n" > std< / span > < span class = "o" > ::< / span > < span class = "n" > string< / span > < span class = "o" > & < / span > < span class = "n" > s< / span > < span class = "p" > );< / span >
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< span class = "c1" > // Returns HTTP date representation of current posix time |t|.< / span >
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< span class = "n" > std< / span > < span class = "o" > ::< / span > < span class = "n" > string< / span > < span class = "n" > http_date< / span > < span class = "p" > (< / span > < span class = "kt" > int64_t< / span > < span class = "n" > t< / span > < span class = "p" > );< / span >
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< span class = "p" > }< / span > < span class = "c1" > // namespace asio_http2< / span >
< span class = "p" > }< / span > < span class = "c1" > // namespace nghttp2< / span >
< span class = "cp" > #endif < / span > < span class = "c1" > // ASIO_HTTP2_H< / span >
< / pre > < / div >
< / div >
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