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the WSGI standard specifies its behavior rather than its inheritance tree (duck typing).The Standard Library includes two other HTTP servers: CGIHTTPServer takes the SimpleHTTPServer and, instead of just serving static files off of the disk, it adds the ability to run CGI scripts (which we will cover in the next section). SimpleXMLRPCServer and DocXMLRPCServer each provide a server endpoint against which client programs can make XML-RPC remote procedure calls, as demonstrated in 18 and Listing 22-1. This protocol uses XML files submitted through HTTP requests.
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Note that none of the preceding servers is typically intended for production use; instead, they are useful for small internal tasks for which you just need a quick HTTP endpoint to be used by other services internal to a system or subnet. And while most Python web frameworks will provide a way to run your application from the command line for debugging, most follow the lead of Django in recommending against using the development platform for debugging. However, a few Python web frameworks exist that not only provide their own built-in HTTP servers, but have also worked on their security and performance, so that they can be recommended for use in production. These pure-Python web servers can be very useful if you are writing an application that users will be installing locally, and you want to provide a web interface without having to ship a separate web server like Apache or nginx. Frameworks that offer a pure-Python integrated web server include CherryPy; Zope, and thus Grok and BFG; web2py; and web.py.
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When the first experiments were taking place with dynamically generated web pages, developers would write an external program and have their web server run the program every time a matching HTTP request arrived. This resembled the behavior of the traditional inetd server ( 7), which could run an external command to answer each incoming TCP or UDP connection on a listening socket. Many of these early web servers lacked the ability to designate entire sections of a web site as dynamic; for example, you could not tell them, all URLs beneath /cart should be handled by my application. Instead, scripts were simply designated as a new type of content, and then placed right next to static pages, images, and archive files in directories that were already browsable from the web. Just as servers had been told that .html files should be delivered as text/html content and that .jpg files should be returned as images, they were now told that executable .cgi files should be run and their output returned to the HTTP client. Obviously, a calling convention was necessary, and so the Common Gateway Interface (CGI) was defined. It allowed programs in all sorts of languages C, the various Unix shells, awk, Perl, Python, PHP, and so forth to be partners in generating dynamic content. Today, the design of CGI is considered something of a disaster. Running a new process from scratch is just about the most expensive single operation that you can perform on a modern operating system, and requiring that this take place for every single incoming HTTP request is simply madness. You should avoid CGI under all circumstances. But it is possible you might someday have to connect Python code to a legacy HTTP server that does not support at least FastCGI or SCGI, so I will outline CGI's essential features. Three standard lines of communication that already existed between parent and child processes on Unix systems were used by web servers when invoking a CGI script:
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The Unix environment a list of strings provided to each process upon its invocation that traditionally includes things like TZ=EST (the time zone) and COLUMNS=80 (user's screen width) was instead stuffed full of information about the HTTP request that the CGI script was being called upon to answer. The various parts of the request's URL; the user agent string; basic information about the web server; and even a cookie could be included in the list of colon-separated keyvalue pairs. The standard input to the script could be read to end-of-file to receive whatever data had been submitted in the body of the HTTP request using POST. Whether a request was indeed a POST could be checked by examining the REQUEST_METHOD environment variable. Finally, the script would produce content, which it did by writing HTTP headers, a blank line, and then a response body to its standard output. To be a valid response, a Content-Type header was generally necessary at a minimum though in its absence, some web servers would instead accept a Location header as a signal that they should send a redirect.
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Should you ever need to run Python behind an HTTP server that only supports CGI, then I recommend that you use the CGIHandler module from the wsgiref Standard Library package. This lets you use a normal Python web framework to write your service or, alternatively, to roll up your sleeves and write a raw WSGI application and then offer the HTTP server a CGI script, as shown here: import CGIHandler, MyWSGIApp my_wsgi_app = MyWSGIApp() # configuration necessary here CGIHandler().run(my_wsgi_app) Be sure to check whether your web framework of choice already provides a way to invoke it as a CGI script; if so, your web framework will already know all of the steps involved in loading and configuring your application. For complex web frameworks, it might be tedious to run all of the steps manually in a script like this one. The Python Standard Library also includes two more ancient modules related to the CGI protocol. Old CGI scripts written with Python imported the cgi module; this module contains a number of helpers and utilities for interpreting both the standard CGI environment variables and also for parsing GET or POST form parameters, so that you can access them like a dictionary. And, believe it or not, there is actually a CGIHTTPServer module in the Standard Library, so that Python can actually be used as a CGI-enabled HTTP server. Like many other web servers of its era, this module interprets URLs as paths into a directory tree and serves static files directly while invoking CGI scripts as separate processes.
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