* `a` denotes a value of type `R`. * `b` is an object whose type meets the requirements of __ConstBufferSequence__ * `h` denotes a value of type `header<isRequest, Fields>&`. * `v` denotes a value of type `Body::value_type&`. * `n` is a value of type `boost::optional<std::uint64_t>`. * `ec` is a value of type [link beast.ref.boost__beast__error_code `error_code&`].
* `a` denotes a value of type `R`. * `b` is an object whose type meets the requirements of __ConstBufferSequence__ * `h` denotes a value of type `header<isRequest, Fields>&`. * `v` denotes a value of type `Body::value_type&`. * `n` is a value of type `boost::optional<std::uint64_t>`. * `ec` is a value of type [link beast.ref.boost__beast__error_code `error_code&`].
* `b` is an object whose type meets the requirements of __ConstBufferSequence__
* `h` denotes a value of type `header<isRequest, Fields>&`.
* `v` denotes a value of type `Body::value_type&`.
* `n` is a value of type `boost::optional<std::uint64_t>`.
* `ec` is a value of type [link beast.ref.boost__beast__error_code `error_code&`].
* `b` is an object whose type meets the requirements of __ConstBufferSequence__
* `h` denotes a value of type `header<isRequest, Fields>&`.
* `v` denotes a value of type `Body::value_type&`.
* `n` is a value of type `boost::optional<std::uint64_t>`.
* `ec` is a value of type [link beast.ref.boost__beast__error_code `error_code&`].