Boost Beast Translation (zh_Hans)/Doc / Qbk / 04 Http / 03 Streams (qbk)

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2 string ID 12
	Source string description type: paragraph

	English Beast provides synchronous and asynchronous algorithms to parse and serialize HTTP/1 wire format messages on streams. These functions form the message-oriented stream interface: 177/10000 · 177
16 string ID 16
	Source string description type: table title

	English Message Stream Operations 25/10000 · 25
4 string ID 16
	Source string description type: table cell

	English Name 4/10000 · 4
5 string ID 16
	Source string description type: table cell

	English Description 11/10000 · 11
6 string ID 16
	Source string description type: table cell

	English [link beast.ref.boost__beast__http__read.overload3 [*read]] 59/10000 · 59
7 string ID 16
	Source string description type: table cell

	English Read a __message__ from a __SyncReadStream__. 45/10000 · 45
8 string ID 16
	Source string description type: table cell

	English [link beast.ref.boost__beast__http__async_read.overload2 [*async_read]] 71/10000 · 71
9 string ID 16
	Source string description type: table cell

	English Read a __message__ from an __AsyncReadStream__. 47/10000 · 47
10 string ID 16
	Source string description type: table cell

	English [link beast.ref.boost__beast__http__write.overload1 [*write]] 61/10000 · 61
11 string ID 16
	Source string description type: table cell

	English Write a __message__ to a __SyncWriteStream__. 45/10000 · 45
12 string ID 16
	Source string description type: table cell

	English [link beast.ref.boost__beast__http__async_write [*async_write]] 63/10000 · 63
13 string ID 16
	Source string description type: table cell

	English Write a __message__ to an __AsyncWriteStream__. 47/10000 · 47
14 string ID 40
	Source string description type: paragraph

	English All synchronous stream operations come in two varieties. One which throws an exception upon error, and another which accepts as the last parameter an argument of type [link beast.ref.boost__beast__error_code `error_code&`]. If an error occurs this argument will be set to contain the error code. 295/10000 · 295
15 string ID 47
	Source string description type: heading

	English Reading 7/10000 · 7
16 string ID 49
	Source string description type: paragraph

	English Because a serialized header is not length-prefixed, algorithms which parse messages from a stream may read past the end of a message for efficiency. To hold this surplus data, all stream read operations use a passed-in __DynamicBuffer__ which must be persisted between calls until the end of stream is reached or the stream object is destroyed. Each read operation may consume bytes remaining in the buffer, and leave behind new bytes. In this example we declare the buffer and a message variable, then read a complete HTTP request synchronously: 546/10000 · 546
17 string ID 60
	Source string description type: paragraph

	English This example uses __flat_buffer__. Beast's __basic_parser__ is optimized for structured HTTP data located in a single contiguous (['flat]) memory buffer. When not using a flat buffer the implementation may perform an additional memory allocations to restructure the input into a single buffer for parsing. 305/10000 · 305
18 string ID 67
	Source string description type: paragraph

	English Other Implementations of __DynamicBuffer__ may avoid parser 59/10000 · 59
19 string ID 72
	Source string description type: paragraph

	English Messages may also be read asynchronously. When performing asynchronous stream read operations the stream, buffer, and message variables must remain valid until the operation has completed. Beast asynchronous initiation functions use Asio's completion handler model. This call reads a message asynchronously and reports the error code upon completion. The handler is called with the error, set to any that occurs, and the number of bytes parsed. This number may be used to measure the relative amount of work performed, or it may be ignored as this example shows. 562/10000 · 562
20 string ID 84
	Source string description type: paragraph

	English If a read stream algorithm cannot complete its operation without exceeding the maximum specified size of the dynamic buffer provided, the error [link beast.ref.boost__beast__http__error `buffer_overflow`] is returned. This is one technique which may be used to impose a limit on the maximum size of an HTTP message header for protection from buffer overflow attacks. The following code will print the error message: 415/10000 · 415
21 string ID 95
	Source string description type: heading

	English Writing 7/10000 · 7

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