WWW Retrieval of URI content from the web. Provides a wrapper to the resolution of URIs to give content using an underlying WWW-retrieval library. The content is delivered by callbacks and includes returning content type for handling content-negotation by the caller as well as chunks of byte content. @world: @Returns: @world: @connection: @Returns: @www: @www: @userdata: @ptr: @size: @nmemb: @www: @userdata: @content_type: @www: @user_agent: @user_agent_len: @Returns: @www: @user_agent: @www: @proxy: @proxy_len: @Returns: @www: @proxy: @www: @value: @value_len: @Returns: @www: @value: @www: @cache_control: @Returns: @www: @handler: @user_data: @www: @timeout: @www: @handler: @user_data: @user_data: @uri: @Returns: @www: @filter: @user_data: @www: @userdata: @final_uri: @www: @Returns: @www: @handler: @user_data: @www: @uri: @Returns: @www: @uri: @string_p: @length_p: @malloc_handler: @Returns: @www: @Returns: @www: @cert_filename: @cert_type: @cert_passphrase: @Returns: @www: @verify_peer: @verify_host: @Returns: @www: @reason: