Creating a Handler

As stated earlier, a handler is a function accepts a Psr\Http\Message\RequestInterface and array of request options and returns a GuzzleHttp\Promise\PromiseInterface that is fulfilled with a Psr\Http\Message\ResponseInterface or rejected with an exception.

A handler is responsible for applying the following 请求选项. These request options are a subset of request options called “transfer options”.

• cert
• connect_timeout
• debug
• delay
• decode_content
• expect
• proxy
• sink
• timeout
• ssl_key
• stream
• verify