# Variables
AddHostExecEnvUserAgentHandler is a request handler appending the SDK's execution environment to the user agent.
AfterRetryHandler performs final checks to determine if the request should be retried and how long to delay.
BuildContentLengthHandler builds the content length of a request based on the byteplusbody, or will use the HTTPRequest.Header's "Content-Length" if defined.
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SDKVersionUserAgentHandler is a request handler for adding the SDK Version to the user agent.
SendHandler is a request handler to send service request using HTTP client.
ValidateEndpointHandler is a request handler to validate a request had the appropriate Region and Endpoint set.
ValidateParametersHandler is a request handler to validate the input parameters.
ValidateReqSigHandler is a request handler to ensure that the request's signature doesn't expire before it is sent.
ValidateResponseHandler is a request handler to validate service response.