Re: [Boost-users] Boost.Beast includes CRLF in HTTP fields

Subject: Re: [Boost-users] Boost.Beast includes CRLF in HTTP fields
From: Richard Hodges (hodges.r_at_[hidden])
Date: 2018-07-07 08:43:45

On Fri, 6 Jul 2018 at 17:32, Vinnie Falco via Boost-users <
boost-users_at_[hidden]> wrote:

> On Fri, Jul 6, 2018 at 3:45 AM, David Demelier via Boost-users
> <boost-users_at_[hidden]> wrote:
> > It looks like HTTP response headers are saved with trailing CRLF in the
> > message upon receiption after (async_)read.
>
> Yes, beast::http::basic_fields stores each field/value pair in its
> serialized format, which includes the trailing CRLF and also the colon
> and space. It is done this way so that beast::http::serializer
> requires no memory allocations to perform its function.
>
> > Since it usually does not add additional valuable information, would it
> > be possible to remove them in next version of Boost.Beast?
>
> No
>
> > It will be more convenient as you don't need to trim them when you want
> > to capture the field value.
>
> You shouldn't have to do any trimming. basic_fields member functions
> and iterator value_type which return field values do so using a
> string_view, whose length excludes the trailing CRLF and also any
> colon and space. Callers should not assume the string is
> null-terminated, and work with the interface provided by string_view.
>
> See:
>
> <
> https://www.boost.org/doc/libs/1_67_0/libs/beast/doc/html/beast/ref/boost__beast__http__basic_fields__value_type/name_string.html
> >
> <
> https://www.boost.org/doc/libs/1_67_0/libs/beast/doc/html/beast/ref/boost__beast__http__basic_fields__value_type/value.html
> >
> <
> https://www.boost.org/doc/libs/1_67_0/libs/beast/doc/html/beast/ref/boost__beast__http__basic_fields/operator_lb__rb_/overload1.html
> >
>
>
Out of interest, why do these functions return a const string_view?

> Thanks
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