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#### http::opt_token_list

A list of tokens in a comma separated HTTP field value.

##### Synopsis

Defined in header `<boost/beast/http/rfc7230.hpp>`

    using opt_token_list = detail::basic_parsed_list< detail::opt_token_list_policy >;

##### Description

This container allows iteration of a list of items in a header field value. The input is a comma separated list of tokens. If a parsing error is encountered while iterating the string, the behavior of the container will be as if a string containing only characters up to but excluding the first invalid character was used to construct the list.

##### BNF

    token-list  = *( "," OWS ) token *( OWS "," [ OWS token ] )

To use this class, construct with the string to be parsed and then use `begin` and `end`, or range-for to iterate each item:

##### Example

    for(auto const& token : token_list{"apple, pear, banana"})
        std::cout << token << "\n";

Convenience header `<boost/beast/http.hpp>`