What is a Proxy Server?
A Proxy server is an intermediate link between a user (browser, mobile application) and a website that transfers traffic between them. Proxies diverge end-user clients from the websites they browse and provide multiple levels of functionality and security. Proxy servers work as web filters and firewalls between the client and the Internet. When using proxy servers, all requests to the Internet first go to the proxy server, which evaluates the request, applies a set of rules to it, and then, if necessary, redirects the request to the Internet.
What is the Python Request Library?
Requests Library is a most popular Library that makes it uncomplicated to send HTTP requests using POST, GET and DELETE methods. The Requests library is based on the urllib3 library and hides the complexity of making HTTP requests behind a simple API. The Requests Library supports SSL connections, international domain names, and session cookies. The Requests Library is not contained in the Python distribution, but almost everyone uses Requests Library because the Python code for working with HTTP becomes straightforward, simple, and understandable.
How to install the Python Requests Library?
You can install the Requests Library using the pip package installer for Python:
After installing the Requests Library, you can use it in your code by importing the Requests Library with the following Python code:
Passing Proxy Address to Python via Environment Variables
Another way to pass a proxy address to Python is to set the http_proxy and https_proxy environment variables. If you set environment variables, you don't need to define any proxies in your code. Just be aware that proxy settings passed through code now override settings set via environment variables.
What is an Environment Variable?
The environment variable is a key-value pair that is set at the system level and can affect all running processes on the computer. An environment variable is part of the operating system in which a process runs. In 1979, Unix introduced environment variables. Today, all major operating systems, including Linux, macOS, and Windows, support environment variables.
How to set a proxy for Requests Session object?
Sometimes you need to use a proxy for a Session object in Python. You can do this by creating a Session object and setting the Session.proxies object with a dictionary containing the list of proxies.
How to specify proxy authentication in Python?
To specify proxy server authentication, use the following syntax for your proxy server:
How to use SOCKS proxy server with Python Requests?
In addition to the basic HTTP proxies, the Request Library also supports proxies that use the SOCKS protocol. To use the SOCKS proxy, you first need to install an additional library with pip:
Once these dependencies are installed, a SOCKS proxy is no more complicated than an HTTP proxy. The following is an example of SOCKS proxy requests in Python:
What is a SOCKS Proxy?
Socket Secure (SOCKS) is a network communication protocol used to redirect network traffic from clients to real servers. The SOCKS proxy exchanges network packets between clients and web servers like the HTTP proxy. With SOCKS, you can transfer data transparently over HTTP, HTTPS, POP3, SMTP, FTP, and SFT streams.
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- How do I send a POST request using Python Requests Library?
- How do I send a GET request using Python Requests Library?
- How to send custom HTTP headers using the PythonRequests Library?