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Listing 9 1. An HTTP Request and Response that Prints All Headers #!/usr/bin/env python # Foundations of Python Network Programming - 9 - verbose_handler.py # HTTP request handler for urllib2 that prints requests and responses. import StringIO, httplib, urllib2 class VerboseHTTPResponse(httplib.HTTPResponse): def _read_status(self): s = self.fp.read() print '-' * 20, 'Response', '-' * 20 print s.split('\r\n\r\n')[0] self.fp = StringIO.StringIO(s) return httplib.HTTPResponse._read_status(self) class VerboseHTTPConnection(httplib.HTTPConnection): response_class = VerboseHTTPResponse def send(self, s): print '-' * 50 print s.strip() httplib.HTTPConnection.send(self, s) class VerboseHTTPHandler(urllib2.HTTPHandler): def http_open(self, req): return self.do_open(VerboseHTTPConnection, req) To allow for customization, the urllib2 library lets you bypass its vanilla urlopen() function and instead build an opener full of handler classes of your own devising a fact that we will use repeatedly as this chapter progresses. Listing 9 1 provides exactly such a handler class by performing a slight customization on the normal HTTP handler. This customization prints out both the outgoing request and the incoming response instead of keeping them both hidden. For many of the following examples, we will use an opener object that we build right here, using the handler from Listing 9 1: >>> from verbose_http import VerboseHTTPHandler >>> import urllib, urllib2 >>> opener = urllib2.build_opener(VerboseHTTPHandler) You can try using this opener against the URL of the RFC that we mentioned at the beginning of this chapter: opener.open('http://www.ietf.org/rfc/rfc2616.txt') The result will be a printout of the same HTTP request and response that we used as our example at the start of the chapter. We can now use this opener to examine every part of the HTTP protocol in more detail.

n 8, you learned about the Popfly SDK and how to use Microsoft Visual Web Developer to run it. In this chapter, you will walk through the creation of a block from scratch using the SDK and Visual Web Developer (VWD). We will also briefly explore the debugging capabilities of VWD and how it can help you test your block code.

When the earliest version of HTTP was first invented, it had a single power: to issue a method called GET that named and returned a hypertext document from a remote server. That method is still the backbone of the protocol today.

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Figure 5-10. Parameter arrays An important thing to remember about parameter arrays is that when the array is created in the heap, the values of the actual parameters are copied to the array. In this way, they are like value parameters: If the array parameter is a value type, the values are copied, and the actual parameters cannot be affected inside the method. If the array parameter is a reference type, the references are copied, and the objects referenced by the actual parameters can be affected inside the method.

From now on, I am going to make heavy use of ellipsis (three periods in a row: ..) to omit parts of each HTTP request and response not currently under discussion That way, we can more easily focus on the protocol features being described The GET method, like all HTTP methods, is the first thing transmitted as part of an HTTP request, and it is immediately followed by the request headers For simple GET methods, the request simply ends with the blank line that terminates the headers so the server can immediately stop reading and send a response: >>> info = openeropen('http://wwwietforg/rfc/rfc2616txt') -------------------------------------------------GET /rfc/rfc2616txt HTTP/11 .. Host: wwwietforg .. -------------------- Response -------------------HTTP/11 200 OK ...

You can also create and populate an array before the method call, and pass the single array variable as the actual parameter. In this case, the compiler uses your array, rather than creating one. For example, the following code uses method ListInts, declared in the previous example. In this code, Main creates an array and uses the array variable as the actual parameter, rather than using separate integers. static void Main() { int[] MyArr = new int[] { 5, 6, 7 }; MyClass mc = new MyClass(); mc.ListInts(MyArr); foreach (int x in MyArr) Console.WriteLine("{0}", x); } This code produces the following output: 50 60 70

Content-Type: text/plain The opener s open() method, like the plain urlopen() function at the top level of urllib2, returns an information object that lets us examine the result of the GET method You can see that the HTTP request started with a status line containing the HTTP version, a status code, and a short message The info object makes these available as object attributes; it also lets us examine the headers through a dictionary-like object: >>> infocode 200 >>> infomsg 'OK' >>> sorted(infoheaderskeys()) ['accept-ranges', 'connection', 'content-length', 'content-type', 'date', 'etag', 'last-modified', 'server', 'vary'] >>> infoheaders['Content-Type'] 'text/plain' Finally, the info object is also prepared to act as a file The HTTP response status line, the headers, and the blank line that follows them have all been read from the HTTP socket, and now the actual document is waiting to be read.

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