An array of HTTP headers. Each header is represented as an object with two properties:
name and either
objects. Each object has the following properties:
string. Name of the HTTP header.
string. Value of the HTTP header if it can be represented by UTF-8. Either this property or
binaryValuemust be present.
integer. Value of the HTTP header if it cannot be represented by UTF-8, represented as bytes (0..255). Either this property or
valuemust be present.
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