Exit Zen
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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.
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Description
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Every completion handler (also referred to as a [@https://en.wikipedia.org/wiki/Continuation ['continuation]]) has both an [@boost:/doc/html/boost_asio/overview/core/allocation.html ['associated allocator]] returned by [@boost:/doc/html/boost_asio/reference/get_associated_allocator.html `net::get_associated_allocator`], , an [@boost:/doc/html/boost_asio/reference/associated_cancellation_slot.html ['associated cancellation slot]] returned by [@boost:/doc/html/boost_asio/reference/associated_cancellation_slot.html `net::get_associated_cancellation_slot`]. and an [@boost:/doc/html/boost_asio/reference/associated_executor.html ['associated executor]] returned by [@boost:/doc/html/boost_asio/reference/get_associated_executor.html `net::get_associated_executor`]. These associations may be specified intrusively:
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[*4]
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[link beast.ref.boost__beast__http__request_header `request_header`]
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Parser Stream Operations
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Boost 1.87
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`U`
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`std::uint64_t`
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`f.is_open()`
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* The specialized trait classes generate a proliferation of small
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The implementation calls this constructor to indicate that the fields being serialized form part of an HTTP response. The lifetime of `f` is guaranteed to end no earlier than after the `W` is destroyed.
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`a.init(ec)`
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Returns the target string. The implementation only calls this function for request headers.
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This function sets the maximum allowed size of the header including all field name, value, and delimiter characters and also including the CRLF sequences in the serialized input.
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Configuration
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Function
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The implementation takes ownership by decay-copy of the invocable object used as the decorator. Move-only types are possible:
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This function returns an iterable range representing the passed buffer sequence. The values obtained when iterating the range will always be a constant buffer, unless the underlying buffer sequence is mutable, in which case the value obtained when iterating will be a mutable buffer. It is intended as a notational convenience when writing a ['range-for] statement over a buffer sequence.

The function [link beast.ref.boost__beast__buffers_range_ref `buffers_range`] maintains a copy of the buffer sequence, while [link beast.ref.boost__beast__buffers_range_ref `buffers_range_ref`] maintains a reference (in this case, the caller must ensure that the lifetime of the referenced buffer sequence extends until the range object is destroyed).
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Handshake Buffering
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