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66 ” PEAR::HTTP_Client U sing the Client HTTP_Client persists explicit sets of headers and requests parameters across multiple requests, which are set using the setDefaultHeader and setRequestParameter methods respectively. The client constructor also accepts arrays of these. Default headers and request parameters can be cleared by calling reset on the client instance. Internally, the client class actually creates a new instance of HTTP_Request per request. The request operation is set depending on which of the client instance methods are called; get, head, and post are supported. The capabilities of the client described up to this point can all be accomplished by reusing the same request instance for multiple requests. H o wever, the client also handles two things that the request class does not: cookies and redirects. By default, cookies are persisted automatically across requests without any additional configuration. HTTP_Client_CookieManager is used internally for this. F or custom cookie handling, this class can be extended and an instance of it passed as the third parameter to the client constructor. If this is done, that instance will be used rather than an instance of the native cookie manager class being created by default. The maximum number of redirects to process can be set using the setMaxRedirects method of the client class. Internally, requests will be created and sent as needed to process the redirect until a non-redirecting response is received or the maximum redirect limit is reached. In the former case, the client method being called will return an integer containing the response code rather than true as the request class does. In the latter case, the client method will return an error instance. N ote that the client class will process redirects contained in meta tags of HTML documents in addition to those performed at the HTTP level. To retrieve information for the last response received, use the currentResponse method of the client instance. It will return an associative array containing the keys ’code’, ’headers’, and ’body’ with values corresponding to the return values of request methods getResponseCode, getResponseHeader, and getResponseBody respectively. By default, all responses are stored and can be accessed individually as sho wn belo w . To disable storage of all responses except the last one, call enableHistory on the client instance and pass it false.
PEAR::HTTP_Client ” 67 } ?> $url = $client->key(); $response = $client->current(); Observing R equests Both HTTP_Request and HTTP_Client have attach and detach methods for adding and remo ving instances of HTTP_Request_Listener. This class implements the observer design pattern and serves to intercept events that occur during the process of transmitting a request and receiving a response. To create an observer, first create a class that extends HTTP_Request_Listener as sho wn belo w .
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Chapter 1 Introduction If you are l
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Introduction ” 3 in some instance
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