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));