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(Swift 2) 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>."
func chilkatTest() { // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. let rest = CkoRest() // 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: let url = CkoUrl() url.ParseUrl("http://www.nytimes.com/pages/business/index.html") var bAutoReconnect: Bool = true var success: Bool = rest.Connect(url.Host, port: url.Port.intValue, tls: url.Ssl, autoReconnect: bAutoReconnect) // Send the GET request (This sends the GET request, but does not read the response.) success = rest.SendReqNoBody("GET", uriPath: url.Path) if success != true { print("\(rest.LastErrorText)") return } // Read the response header. var responseStatusCode: Int = rest.ReadResponseHeader().intValue if responseStatusCode < 0 { print("\(rest.LastErrorText)") return } print("Response status code = \(responseStatusCode)") // 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 var errResponse: String? = rest.ReadRespBodyString() if rest.LastMethodSuccess != true { print("\(rest.LastErrorText)") } else { print("\(errResponse!)") } return } let bodyStream = CkoStream() // Set a 10 second read timeout for the stream. // (Give up if no data arrives within 10 seconds after calling a read method.) bodyStream.ReadTimeoutMs = 10000 // Create a background thread task to read the response body (which feeds // it to the bodyStream object.) var readResponseBodyTask: CkoTask? = rest.ReadRespBodyStreamAsync(bodyStream, autoSetStreamCharset: 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. let sbBody = CkoStringBuilder() var exitLoop: Bool = false while !exitLoop && (bodyStream.EndOfStream != true) { var bodyText: String? = bodyStream.ReadString() if bodyStream.LastMethodSuccess == true { sbBody.Append(bodyText) if sbBody.Contains("</head>", caseSensitive: false) { exitLoop = true } } else { exitLoop = true } } // Cancel the remainder of the task... readResponseBodyTask!.Cancel() readResponseBodyTask = nil // Ensure we're disconnected from the server. var maxWaitMs: Int = 50 rest.Disconnect(maxWaitMs) print("----") print("\(sbBody.GetAsString())") print("----") print("Successfully received the body up to the desired point.") } |
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