Adds a header with {@code name} and {@code value}. Prefer this method for multiply-valued
headers like "Cookie".
<p>Note that for some headers including {@code Content-Length} and {@code Content-Encoding},
OkHttp may replace {@code value} with a header derived from the request body.
Adds a header with {@code name} and {@code value}. Prefer this method for multiply-valued headers like "Cookie".
<p>Note that for some headers including {@code Content-Length} and {@code Content-Encoding}, OkHttp may replace {@code value} with a header derived from the request body.