HttpHeaders

A collection of HTTP headers that supports multiple values for the same header key.

Unlike Map<String, String>, this type allows adding the same header multiple times, which is necessary for headers like Set-Cookie that can appear multiple times in HTTP responses.

The underlying storage is a flat array of strings in the format: [key1, value1, key2, value2, ...]

Example usage:

var headers = new HttpHeaders();
headers.add("Content-Type", "application/json");
headers.add("Set-Cookie", "session=abc123");
headers.add("Set-Cookie", "user=john");  // Same header, different value

for (header in headers) {
    trace(header.key + ": " + header.value);
}

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