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(PHP Extension) HTTP GET -- Read Response from StreamDemonstrates how to send an HTTP GET for a web page, and then read the response from a Stream. The purpose is to fulfill a situation such as the following: "I have a URL and just want the <head> </head> portion of the HTML. This would avoid having to download a potentially enormous web page just to get at header information, such as the <styles>."
<?php // The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number. // For example, if using Chilkat v9.5.0.48, then include as shown here: include("chilkat_9_5_0.php"); // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. $rest = new CkRest(); // In this example, we'll get the web page at http://www.nytimes.com/pages/business/index.html // The domain is "www.nytimes.com", and the path is "/pages/business/index.html" // If we have only the full URL to begin with, it can be loaded into the Chilkat URL object to // access the parts: $url = new CkUrl(); $url->ParseUrl('http://www.nytimes.com/pages/business/index.html'); $bAutoReconnect = true; $success = $rest->Connect($url->host(),$url->get_Port(),$url->get_Ssl(),$bAutoReconnect); // Send the GET request (This sends the GET request, but does not read the response.) $success = $rest->SendReqNoBody('GET',$url->path()); if ($success != true) { print $rest->lastErrorText() . "\n"; exit; } // Read the response header. $responseStatusCode = $rest->ReadResponseHeader(); if ($responseStatusCode < 0) { print $rest->lastErrorText() . "\n"; exit; } print 'Response status code = ' . $responseStatusCode . "\n"; // We expect a 200 response status. if ($responseStatusCode != 200) { // If the response status code is not 200, we could check for a redirect status code and // then follow it, read the entire response (as shown here), or just call rest.Disconnect $errResponse = $rest->readRespBodyString(); if ($rest->get_LastMethodSuccess() != true) { print $rest->lastErrorText() . "\n"; } else { print $errResponse . "\n"; } exit; } $bodyStream = new CkStream(); // Set a 10 second read timeout for the stream. // (Give up if no data arrives within 10 seconds after calling a read method.) $bodyStream->put_ReadTimeoutMs(10000); // Create a background thread task to read the response body (which feeds // it to the bodyStream object.) // readResponseBodyTask is a CkTask $readResponseBodyTask = $rest->ReadRespBodyStreamAsync($bodyStream,true); // Start the task. $success = $readResponseBodyTask->Run(); // Read the HTTP response body until the "</head>" is seen, or until // the end-of-stream is reached. $sbBody = new CkStringBuilder(); $exitLoop = false; while (!$exitLoop and ($bodyStream->get_EndOfStream() != true)) { $bodyText = $bodyStream->readString(); if ($bodyStream->get_LastMethodSuccess() == true) { $sbBody->Append($bodyText); if ($sbBody->Contains('</head>',false)) { $exitLoop = true; } } else { $exitLoop = true; } } // Cancel the remainder of the task... $readResponseBodyTask->Cancel(); // Ensure we're disconnected from the server. $maxWaitMs = 50; $rest->Disconnect($maxWaitMs); print '----' . "\n"; print $sbBody->getAsString() . "\n"; print '----' . "\n"; print 'Successfully received the body up to the desired point.' . "\n"; ?> |
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