Ruby module OpenURI to get http/FTP address content

Ruby has some special modules that are useful. For example, the Ruby module OpenURI introduced here is a common Ruby module. We need to be familiar with its features.

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To obtain the content of an HTTP/FTP address in Ruby, you can easily use the open-uri library.

Ruby module OpenURI is included in ruby's standard additional library, path: lib/oepn-uri.rb

After referencing this additional library, you can open the resource of an http/ftp uri just like opening a common file.

The differences between the Ruby module OpenURI are as follows:

1. Require 'open-uri'
2. Open ('C:/boot. ini ') {| file |
3. Puts file. class # File
4. }
5. Open ('HTTP: // coderlee.
   Cnblogs.com ') {| file |
6. Puts file. class # Tempfile
7. }

It can be seen that the block parameter for opening a local File is of the File type, while the block parameter for opening a uri is of the Tempfile type.

Note that the open method in open-uri will automatically track access to the 302 redirection address, while the Net: HTTP # get method will not automatically track the 302 redirection address.

The final value returned by this function is the final value of the incoming code block. You can obtain the OpenURI content of the Ruby module in this way.

 
 

  
  
data = open('http://coderlee.
cnblogs.com'){|f| f.read}  
  
  
data = open('http://coderlee.
cnblogs.com'){|f| f}.open.read 
 
 

The reason for the second open statement is that the stream returned by the open method is the closed tempfile. Therefore, open the stream first, return the opened stream, and then call read to read the stream.