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303 See Other: The original URL should continue to be used for this request, but on this occasion the response can be found by retrieving a different URL the one in the response s Location: header. If the operation was a POST or PUT (which we will learn about later in this chapter), then a 303 means that the operation has succeeded, and that the results can be viewed by doing a GET at the new location. 304 Not Modified: The response would normally be a 200 OK, but the HTTP request headers indicate that the client already possesses an up-to-date copy of the resource, so its body need not be transmitted again, and this response will contain only headers. See the section on caching later in this chapter. 307 Temporary Redirect: This is like a 303, except in the case of a POST or PUT, where a 307 means that the action has not succeeded but needs to be retried with another POST or PUT at the URL specified in the response Location: header. 404 Not Found: The URL does not name a valid resource. 500 Internal Server Error: The web site is broken. Programmer errors, configuration problems, and unavailable resources can all cause web servers to generate this code. 503 Service Unavailable: Among the several other 500-range error messages, this may be the most common. It indicates that the HTTP request cannot be fulfilled because of some temporary and transient service failure. This is the code included when Twitter displays its famous Fail Whale, for example.

The mechanics of a method calling itself are exactly the same as if it had called another, different method. A new stack frame is pushed onto the stack for each call to the method. For example, in the following code, method Count calls itself with one less than its input parameter and then prints out its input parameter. As the recursion gets deeper, the stack gets larger. class Program { public void Count(int InVal) { if (InVal == 0) return; Count(InVal - 1); // Invoke this method again. Calls itself Console.WriteLine("{0} ", InVal); } static void Main() { Program pr = new Program(); pr.Count(3); } }

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Each HTTP library makes its own choices about how to handle the various status codes. If its full stack of handlers is left in place, urllib2 will automatically follow redirections. Return codes that cannot be handled, or that indicate any kind of error, are raised as Python exceptions: >>> nonexistent_url = 'http://example.com/better-living-through-http' >>> response = opener.open(nonexistent_url) Traceback (most recent call last): ... HTTPError: HTTP Error 404: Not Found But these exception objects are special: they also contain all of the usual fields and capabilities of HTTP response information objects. Remember that many web servers include a useful human-readable document when they return an error status. Such a document might include specific information about what has gone wrong. For example, many web frameworks at least when in development mode will return exception tracebacks along with their 500 errors when the program trying to generate the web page crashes. By catching the exception, we can both see how the HTTP response looked on the wire (thanks again to the special handler that we have installed in our opener object), and we can assign a name to the exception to look at it more closely: >>> try: ... response = opener.open(nonexistent_url) ... except urllib2.HTTPError, e: ... pass -------------------------------------------------GET /better-living-through-http HTTP/1.1 ... -------------------- Response -------------------HTTP/1.1 404 Not Found Date: ...

This code produces the following output: 1 2 3 Figure 5-12 illustrates the code. Notice that with an input value of 3, there are four different, independent stack frames for method Count. Each has its own value for input parameter InVal.

Click the link to go to the Development Center page (see Figure 9-5). Most reliable providers have an area, like Technorati s Development Center, on their sites that is for developers who want to use their APIs; the Development Center has a lot of documentation and tutorials. Extensive developer documentation is an important consideration on the service you want to use. It is a sign of the reliability, professionalism, and quality of the APIs.

Server: Apache Content-Length: 285 Connection: close Content-Type: text/html; charset=iso-8859 1 As you can see, this particular web site does include a human-readable document with a 404 error; the response declares it to be an HTML page that is exactly 285 octets in length (We will learn more about content length and types later in the chapter) Like any HTTP response object, this exception can be queried for its status code; it can also be read like a file to see the returned page: >>> ecode 404 >>> emsg 'Not Found' >>> ereadline() '<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 20//EN">\n' If you try reading the rest of the file, then deep inside of the HTML you will see the actual error message that a web browser would display for the user: >>> eread() '..The requested URL /better-living-through-http was not found on this server...

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