description

# forEach method Null safety

void forEach (

1. void action(
   1. String name,
   2. List<String> values
   )

)

Performs the `action` on each header.

The `action` function is called with each header's name and a list of the header's values. The casing of the name string is determined by the last add or set operation for that particular header, which defaults to lower-casing the header name unless explicitly set to preserve the case.

## Implementation

    void forEach(void action(String name, List<String> values));