HTTP Programming Recipes for C# Bots - download pdf or read online

C

By Jeff Heaton

The Hypertext move Protocol (HTTP) permits info to be exchanged among an internet server and an online browser. C# lets you application HTTP at once. HTTP programming helps you to create courses that entry the internet very like a human person might. those courses, that are known as bots, can acquire info or automate universal internet programming initiatives. This publication provides a set of very reusable recipes for C# bot programming. This booklet covers many issues regarding C# HTTP programming. either safe and insecure HTTP communications are lined, in addition to HTTP authentication. learn how to have interaction with HTTP varieties and help either HTTP submit and HTTP GET requests. gather info from a big selection of HTML constructs, akin to tables, and lists. know about complicated subject matters that complicate the lifetime of a bot, reminiscent of AJAX and Javascript. additionally find out about the moral use of bots, and whilst bots shouldn't be used. This publication additionally introduces the Heaton learn Spider. The Heaton study Spider is an open resource spider framework. utilizing the Heaton study Spider you could create spiders that might move slowly an internet site, very similar to a true spider crawls the internet. The Heaton study Spider comes in either Java and Microsoft Dot web shape

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Additional resources for HTTP Programming Recipes for C# Bots

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5 shows such a form. 5: An HTML Form The arguments used by the form are specified in the HTML. 5.

As can be seen from the above form, there are two tags that both accept text from the user. These tags are picked up as posted variables when the POST request is sent to the web server. 6. 5? The arguments are displayed as POST arguments, rather than HTTP GET arguments. Additionally, the request type is POST. So far, only the data passed in HTTP requests and responses has been examined.

Sites that make use of web services provide access to their data through XML. This makes it considerably easier to access their data than writing a traditional bot. Additionally, you can use web services in conjunction with regular bot programming. This produces a hybrid bot. Chapter 12 shows how to create bots that make use of RSS feeds. RSS is an XML format that allows quick access to the newest content on a web site. Bots can be constructed to automatically access RSS information from a web site.

The headers are read until a blank line is found. As was discussed earlier in this chapter, a blank line indicates the end of HTTP headers. Length>0 ); Once the first blank line is hit, the program is done reading the HTTP headers. Because this server only supports GET requests, the program is also done reading the HTTP request. Now it is time to write the HTTP response. The following lines of code write a simple HTML message that says “Hello World” to the browser. 1 200 OK"); SocketWrite(socket,""); SocketWrite(socket,""); Chapter 1: The Structure of HTTP Requests SocketWrite(socket, "Simple Web Server"); SocketWrite(socket,""); SocketWrite(socket,"

Hello World

"); SocketWrite(socket,""); SocketWrite(socket,""); Now that the message has been written, it is time to close the streams.

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