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Instead of stuffing form parameters into the URL, a POST carries them in the body of the request. We can perform the same action ourselves in Python by using urlencode to format the form parameters, and then supplying them as a second parameter to any of the urllib2 methods that open a URL. Here is a simple POST to the U.S. National Weather Service that asks about the forecast for Atlanta, Georgia: >>> form = urllib.urlencode({'inputstring': 'Atlanta, GA'}) >>> response = opener.open('http://forecast.weather.gov/zipcity.php', form) -------------------------------------------------POST /zipcity.php HTTP/1.1 ... Content-Length: 25 Host: forecast.weather.gov Content-Type: application/x-www-form-urlencoded ... -------------------------------------------------inputstring=Atlanta%2C+GA -------------------- Response -------------------HTTP/1.1 302 Found ... Location: http://forecast.weather.gov/MapClick.php CityName=Atlanta&state=GA &site=FFC&textField1=33.7629&textField2=-84.4226&e=1 ... -------------------------------------------------GET /MapClick.php CityName=Atlanta&state=GA&site=FFC&textField1=33.7629&textField2= -84.4226&e=1 HTTP/1.1 ... -------------------- Response -------------------HTTP/1.1 200 OK ... Although our opener object is putting a dashed line between each HTTP request and its payload for clarity (a blank line, you will recall, is what really separates headers and payload on the wire) you are otherwise seeing a raw HTTP POST method here. Note these features of the request-responses shown in the example above: The request line starts with the string POST. Content is provided (and thus, a Content-Length header). The form parameters are sent as the body. The Content-Type for standard web forms is x-www-form-urlencoded.

The most important thing to grasp is that GET and POST are most emphatically not simply two different ways to format form parameters! Instead, they actually mean two entirely different things. The GET method means, I believe that there is a document at this URL; please return it. The POST method means, Here is an action that I want performed. Note that POST must always be the method used for actions on the Web that have side effects. Fetching a URL with GET should never produce any change in the web site from which the page is fetched. Requests submitted with POST, by contrast, can be requests to add, delete, or alter content.

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The previous two chapters covered two of the nine types of class members: fields and methods. In this chapter, I will introduce more class member types, and discuss the lifetimes of class members. Table 6-1 shows a list of the class member types. Those that have already been introduced are marked with diamonds. Those that will be covered in this chapter are marked with a check. Those that will be covered later in the text are marked with empty check boxes. Table 6-1. Types of Class Members

The Search category contains the following operations: cosmos: Provides blogs that link to a given URL search: Allows you to searching posts using a keyword or phrase tag: Allows you to searching posts that are tagged with a specific topic dailycounts: Provides a count of posts containing the queried keywords

You will already have noticed that the POST we performed earlier in this chapter did something very interesting: instead of simply returning a status of 200 followed by a page of weather forecast data, it instead returned a 302 redirect that urllib2 obeyed by performing a GET for the page named in the Location: header Why add this extra level of indirection, instead of just returning a useful page The answer is that a web site leaves users in a very difficult position if it answers a POST form submission with a literal web page You will probably recognize these symptoms: The web browser will display the URL to which the POST was made, which is generally fairly generic; however, the actual page content will be something quite specific.

Data Members (Store Data)

For example, had the query in the previous section not performed its redirect, then a user of the form would wind up at the URL /zipcityphp This sounds very general, but the user would be looking at the specific forecast for Atlanta The URL winds up being useless when bookmarked or shared Because it was the form parameters that brought Atlanta up, someone e-mailing the /zipcityphp URL to a friend would send them to a page that displays an error instead For example, when the /zipcityphp URL is visited without going through the form, the NWS web site displays this message: Nothing was entered in the search box, or an incorrect format was used The user cannot reload the web page without receiving a frightening warning about whether he wants to repeat his action.

Function Members (Execute Code)

The Browse category contains the following operation: toptags: Provides the most frequently searched indexed tags by Technorati

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