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type: table cell
Normally the parser returns after successfully parsing a structured element (header, chunk header, or chunk body) even if there are octets remaining in the input. This is necessary when attempting to parse the header first, or when the caller wants to inspect information which may be invalidated by subsequent parsing, such as a chunk extension. The `eager` option controls whether the parser keeps going after parsing structured element if there are octets remaining in the buffer and no error occurs. This option is automatically set or cleared during certain stream operations to improve performance with no change in functionality.
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Buffer-Oriented Parsing
Buffer-Oriented Parsing
A subclass of __basic_parser__ can be invoked directly, without using the provided stream operations. This could be useful for implementing algorithms on objects whose interface does not conform to __Stream__. For example, a [@http://zeromq.org/ *ZeroMQ* socket]. The basic parser interface is interactive; the caller invokes the function [link beast.ref.boost__beast__http__basic_parser.put `basic_parser::put`] repeatedly with buffers until an error occurs or the parsing is done. The function [link beast.ref.boost__beast__http__basic_parser.put_eof `basic_parser::put_eof`] Is used when the caller knows that there will never be more data (for example, if the underlying connection is closed),
A subclass of __basic_parser__ can be invoked directly, without using the provided stream operations. This could be useful for implementing algorithms on objects whose interface does not conform to __Stream__. For example, a [@http://zeromq.org/ *ZeroMQ* socket]. The basic parser interface is interactive; the caller invokes the function [link beast.ref.boost__beast__http__basic_parser.put `basic_parser::put`] repeatedly with buffers until an error occurs or the parsing is done. The function [link beast.ref.boost__beast__http__basic_parser.put_eof `basic_parser::put_eof`] Is used when the caller knows that there will never be more data (for example, if the underlying connection is closed),
26
Parser Options
Parser Options
The parser provides a few options which may be set before parsing begins:
The parser provides a few options which may be set before parsing begins:
30
Parser Options
Parser Options
Name
Name
Default
Default
Description
Description
[link beast.ref.boost__beast__http__basic_parser.eager.overload2 `eager`]
[link beast.ref.boost__beast__http__basic_parser.eager.overload2 `eager`]
30
`false`
 
Normally the parser returns after successfully parsing a structured element (header, chunk header, or chunk body) even if there are octets remaining in the input. This is necessary when attempting to parse the header first, or when the caller wants to inspect information which may be invalidated by subsequent parsing, such as a chunk extension. The `eager` option controls whether the parser keeps going after parsing structured element if there are octets remaining in the buffer and no error occurs. This option is automatically set or cleared during certain stream operations to improve performance with no change in functionality.
Normally the parser returns after successfully parsing a structured element (header, chunk header, or chunk body) even if there are octets remaining in the input. This is necessary when attempting to parse the header first, or when the caller wants to inspect information which may be invalidated by subsequent parsing, such as a chunk extension. The `eager` option controls whether the parser keeps going after parsing structured element if there are octets remaining in the buffer and no error occurs. This option is automatically set or cleared during certain stream operations to improve performance with no change in functionality.
[link beast.ref.boost__beast__http__basic_parser.skip.overload2 `skip`]
[link beast.ref.boost__beast__http__basic_parser.skip.overload2 `skip`]
This option controls whether or not the parser expects to see an HTTP body, regardless of the presence or absence of certain fields such as Content-Length or a chunked Transfer-Encoding. Depending on the request, some responses do not carry a body. For example, a 200 response to a [@https://tools.ietf.org/html/rfc7231#section-4.3.6 CONNECT] request from a tunneling proxy, or a response to a [@https://tools.ietf.org/html/rfc7231#section-4.3.2 HEAD] request. In these cases, callers may use this function inform the parser that no body is expected. The parser will consider the message complete after the header has been received.
This option controls whether or not the parser expects to see an HTTP body, regardless of the presence or absence of certain fields such as Content-Length or a chunked Transfer-Encoding. Depending on the request, some responses do not carry a body. For example, a 200 response to a [@https://tools.ietf.org/html/rfc7231#section-4.3.6 CONNECT] request from a tunneling proxy, or a response to a [@https://tools.ietf.org/html/rfc7231#section-4.3.2 HEAD] request. In these cases, callers may use this function inform the parser that no body is expected. The parser will consider the message complete after the header has been received.
[link beast.ref.boost__beast__http__basic_parser.body_limit `body_limit`]
[link beast.ref.boost__beast__http__basic_parser.body_limit `body_limit`]
1MB/8MB
1MB/8MB
This function sets the maximum allowed size of the content body. When a body larger than the specified size is detected, an error is generated and parsing terminates. This setting helps protect servers from resource exhaustion attacks. The default limit when parsing requests is 1MB, and for parsing responses 8MB.
This function sets the maximum allowed size of the content body. When a body larger than the specified size is detected, an error is generated and parsing terminates. This setting helps protect servers from resource exhaustion attacks. The default limit when parsing requests is 1MB, and for parsing responses 8MB.
[link beast.ref.boost__beast__http__basic_parser.header_limit `header_limit`]
[link beast.ref.boost__beast__http__basic_parser.header_limit `header_limit`]
8KB
8KB
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.
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.
Read From std::istream __example__
Read From std::istream __example__
The standard library provides the type `std::istream` for performing high level read operations on character streams. The variable `std::cin` is based on this input stream. This example uses the buffer oriented interface of __basic_parser__ to build a stream operation which parses an HTTP message from a `std::istream`:
The standard library provides the type `std::istream` for performing high level read operations on character streams. The variable `std::cin` is based on this input stream. This example uses the buffer oriented interface of __basic_parser__ to build a stream operation which parses an HTTP message from a `std::istream`:
Parsing from a `std::istream` could be implemented using an alternate
Parsing from a `std::istream` could be implemented using an alternate
Key English Chinese (Simplified Han script) Actions
Parsing from a `std::istream` could be implemented using an alternate
Parsing from a `std::istream` could be implemented using an alternate
Default
Default
Description
Description
[link beast.ref.boost__beast__http__basic_parser.eager.overload2 `eager`]
[link beast.ref.boost__beast__http__basic_parser.eager.overload2 `eager`]
Read From std::istream __example__
Read From std::istream __example__
The standard library provides the type `std::istream` for performing high level read operations on character streams. The variable `std::cin` is based on this input stream. This example uses the buffer oriented interface of __basic_parser__ to build a stream operation which parses an HTTP message from a `std::istream`:
The standard library provides the type `std::istream` for performing high level read operations on character streams. The variable `std::cin` is based on this input stream. This example uses the buffer oriented interface of __basic_parser__ to build a stream operation which parses an HTTP message from a `std::istream`:
Name
Name
Buffer-Oriented Parsing
Buffer-Oriented Parsing
A subclass of __basic_parser__ can be invoked directly, without using the provided stream operations. This could be useful for implementing algorithms on objects whose interface does not conform to __Stream__. For example, a [@http://zeromq.org/ *ZeroMQ* socket]. The basic parser interface is interactive; the caller invokes the function [link beast.ref.boost__beast__http__basic_parser.put `basic_parser::put`] repeatedly with buffers until an error occurs or the parsing is done. The function [link beast.ref.boost__beast__http__basic_parser.put_eof `basic_parser::put_eof`] Is used when the caller knows that there will never be more data (for example, if the underlying connection is closed),
A subclass of __basic_parser__ can be invoked directly, without using the provided stream operations. This could be useful for implementing algorithms on objects whose interface does not conform to __Stream__. For example, a [@http://zeromq.org/ *ZeroMQ* socket]. The basic parser interface is interactive; the caller invokes the function [link beast.ref.boost__beast__http__basic_parser.put `basic_parser::put`] repeatedly with buffers until an error occurs or the parsing is done. The function [link beast.ref.boost__beast__http__basic_parser.put_eof `basic_parser::put_eof`] Is used when the caller knows that there will never be more data (for example, if the underlying connection is closed),
The parser provides a few options which may be set before parsing begins:
The parser provides a few options which may be set before parsing begins:
Normally the parser returns after successfully parsing a structured element (header, chunk header, or chunk body) even if there are octets remaining in the input. This is necessary when attempting to parse the header first, or when the caller wants to inspect information which may be invalidated by subsequent parsing, such as a chunk extension. The `eager` option controls whether the parser keeps going after parsing structured element if there are octets remaining in the buffer and no error occurs. This option is automatically set or cleared during certain stream operations to improve performance with no change in functionality.
Normally the parser returns after successfully parsing a structured element (header, chunk header, or chunk body) even if there are octets remaining in the input. This is necessary when attempting to parse the header first, or when the caller wants to inspect information which may be invalidated by subsequent parsing, such as a chunk extension. The `eager` option controls whether the parser keeps going after parsing structured element if there are octets remaining in the buffer and no error occurs. This option is automatically set or cleared during certain stream operations to improve performance with no change in functionality.
[link beast.ref.boost__beast__http__basic_parser.skip.overload2 `skip`]
[link beast.ref.boost__beast__http__basic_parser.skip.overload2 `skip`]
This option controls whether or not the parser expects to see an HTTP body, regardless of the presence or absence of certain fields such as Content-Length or a chunked Transfer-Encoding. Depending on the request, some responses do not carry a body. For example, a 200 response to a [@https://tools.ietf.org/html/rfc7231#section-4.3.6 CONNECT] request from a tunneling proxy, or a response to a [@https://tools.ietf.org/html/rfc7231#section-4.3.2 HEAD] request. In these cases, callers may use this function inform the parser that no body is expected. The parser will consider the message complete after the header has been received.
This option controls whether or not the parser expects to see an HTTP body, regardless of the presence or absence of certain fields such as Content-Length or a chunked Transfer-Encoding. Depending on the request, some responses do not carry a body. For example, a 200 response to a [@https://tools.ietf.org/html/rfc7231#section-4.3.6 CONNECT] request from a tunneling proxy, or a response to a [@https://tools.ietf.org/html/rfc7231#section-4.3.2 HEAD] request. In these cases, callers may use this function inform the parser that no body is expected. The parser will consider the message complete after the header has been received.
[link beast.ref.boost__beast__http__basic_parser.body_limit `body_limit`]
[link beast.ref.boost__beast__http__basic_parser.body_limit `body_limit`]
1MB/8MB
1MB/8MB
This function sets the maximum allowed size of the content body. When a body larger than the specified size is detected, an error is generated and parsing terminates. This setting helps protect servers from resource exhaustion attacks. The default limit when parsing requests is 1MB, and for parsing responses 8MB.
This function sets the maximum allowed size of the content body. When a body larger than the specified size is detected, an error is generated and parsing terminates. This setting helps protect servers from resource exhaustion attacks. The default limit when parsing requests is 1MB, and for parsing responses 8MB.
[link beast.ref.boost__beast__http__basic_parser.header_limit `header_limit`]
[link beast.ref.boost__beast__http__basic_parser.header_limit `header_limit`]
8KB
8KB
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.
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.
26
Parser Options
Parser Options
30
`false`
 
30
Parser Options
Parser Options

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Normally the parser returns after successfully parsing a structured element (header, chunk header, or chunk body) even if there are octets remaining in the input. This is necessary when attempting to parse the header first, or when the caller wants to inspect information which may be invalidated by subsequent parsing, such as a chunk extension. The `eager` option controls whether the parser keeps going after parsing structured element if there are octets remaining in the buffer and no error occurs. This option is automatically set or cleared during certain stream operations to improve performance with no change in functionality.
Normally the parser returns after successfully parsing a structured element (header, chunk header, or chunk body) even if there are octets remaining in the input. This is necessary when attempting to parse the header first, or when the caller wants to inspect information which may be invalidated by subsequent parsing, such as a chunk extension. The `eager` option controls whether the parser keeps going after parsing structured element if there are octets remaining in the buffer and no error occurs. This option is automatically set or cleared during certain stream operations to improve performance with no change in functionality.
06/05/2026
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Source string description
type: table cell
Unit identifier
58792
Source string location
string ID 30
String age
06/05/2026
Last updated
06/05/2026
Source string age
06/05/2026
Translation file QuickBook file
doc/qbk/04_http/07_parser_buffers_zh_Hans.qbk, string 11