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The basic parser uses virtual functions. To declare your user-defined parser, derive from __basic_parser__ and implement all the required virtual functions. A declaration for the derived class may look like this:
The basic parser uses virtual functions. To declare your user-defined parser, derive from __basic_parser__ and implement all the required virtual functions. A declaration for the derived class may look like this:
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* Use a container provided by an external interface.
* Use a container provided by an external interface.
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* Inspect incoming header fields and keep or discard them.
* Inspect incoming header fields and keep or discard them.
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While the parsers included in the library will handle a broad number of use-cases, the __basic_parser__ interface can be subclassed to implement custom strategies for storing parsed results: the basic parser processes input buffers into elements according to the HTTP/1 protocol specification, while the derived class decides what to do with those elements. Custom parsers will work with all of the HTTP stream read algorithms, as those algorithms use only the basic parser interface. Some use cases for implementing custom parsers are:
While the parsers included in the library will handle a broad number of use-cases, the __basic_parser__ interface can be subclassed to implement custom strategies for storing parsed results: the basic parser processes input buffers into elements according to the HTTP/1 protocol specification, while the derived class decides what to do with those elements. Custom parsers will work with all of the HTTP stream read algorithms, as those algorithms use only the basic parser interface. Some use cases for implementing custom parsers are:
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Custom Parsers
Custom Parsers
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Component created (boost_endpoint) 06/05/2026
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Changes committed 06/05/2026
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Parsing of the “doc/qbk/04_http/09_custom_body.qbk” file was enforced. 06/05/2026
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We have created a full featured body type capable of reading and writing files on the filesystem, integrating seamlessly with the HTTP algorithms and message container. The body type works with any file implementation meeting the requirements of __File__ so it may be transparently used with solutions optimized for particular platforms. Example HTTP servers which use file bodies are available in the example directory.
We have created a full featured body type capable of reading and writing files on the filesystem, integrating seamlessly with the HTTP algorithms and message container. The body type works with any file implementation meeting the requirements of __File__ so it may be transparently used with solutions optimized for particular platforms. Example HTTP servers which use file bodies are available in the example directory.
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Finally, here is the implementation of the reader member functions:
Finally, here is the implementation of the reader member functions:
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Files can be read now, and the next step is to allow writing to files by implementing the __BodyReader__. The style is similar to the writer, except that buffers are incoming instead of outgoing. Here's the declaration:
Files can be read now, and the next step is to allow writing to files by implementing the __BodyReader__. The style is similar to the writer, except that buffers are incoming instead of outgoing. Here's the declaration:
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And here are the definitions for the functions we have declared:
And here are the definitions for the functions we have declared:
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Our implementation of __BodyWriter__ will contain a small buffer from which the file contents are read. The buffer is provided to the implementation on each call until everything has been read in.
Our implementation of __BodyWriter__ will contain a small buffer from which the file contents are read. The buffer is provided to the implementation on each call until everything has been read in.
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We will start with the definition of the `value_type`. Our strategy will be to store the file object directly in the message container through the `value_type` field. To use this body it will be necessary to call `msg.body.file().open()` first with the required information such as the path and open mode. This ensures that the file exists throughout the operation and prevent the race condition where the file is removed from the file system in between calls.
We will start with the definition of the `value_type`. Our strategy will be to store the file object directly in the message container through the `value_type` field. To use this body it will be necessary to call `msg.body.file().open()` first with the required information such as the path and open mode. This ensures that the file exists throughout the operation and prevent the race condition where the file is removed from the file system in between calls.
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First we declare the type with its nested types:
First we declare the type with its nested types:
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Use of the flexible __Body__ concept customization point enables authors to preserve the self-contained nature of the __message__ object while allowing domain specific behaviors. Common operations for HTTP servers include sending responses which deliver file contents, and allowing for file uploads. In this example we build the [link beast.ref.boost__beast__http__basic_file_body `basic_file_body`] type which supports both reading and writing to a file on the file system. The interface is a class templated on the type of file used to access the file system, which must meet the requirements of __File__.
Use of the flexible __Body__ concept customization point enables authors to preserve the self-contained nature of the __message__ object while allowing domain specific behaviors. Common operations for HTTP servers include sending responses which deliver file contents, and allowing for file uploads. In this example we build the [link beast.ref.boost__beast__http__basic_file_body `basic_file_body`] type which supports both reading and writing to a file on the file system. The interface is a class templated on the type of file used to access the file system, which must meet the requirements of __File__.
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File Body __example__
File Body __example__
06/05/2026

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