Fast API Reverse Proxy

The proxy domain most often refers to the IP address where the server is located. It can only "learn" the IP address of the user when processing the traffic. But in most cases it does not store such information later for security reasons.

Parsing math expressions correctly involves converting mathematical expressions from their human-readable form into a format that a computer can understand and evaluate. A common approach is to use a parser or library designed for mathematical expressions.

In Python, you can use the sympy library, which provides powerful symbolic mathematics capabilities, including expression parsing and evaluation. Here's an example:

from sympy import sympify, symbols

# Define symbols
x, y = symbols('x y')

# Parse math expressions
expression1 = sympify("2*x + 3*y")
expression2 = sympify("sin(x) + cos(x)")

# Evaluate expressions
result1 = expression1.subs({x: 1, y: 2})
result2 = expression2.subs(x, 0)

print("Result 1:", result1)
print("Result 2:", result2)

In this example, sympify is used to parse the mathematical expressions. You can then substitute values for variables using the subs method.

If you need a more general-purpose parser, you can use the pyparsing library. Here's a basic example:

from pyparsing import Word, nums, operatorPrecedence, opAssoc

# Define grammar for basic math expressions
integer = Word(nums).setParseAction(lambda t: int(t[0]))
variable = Word("xy")
operand = integer | variable
expr = operatorPrecedence(
    operand,
    [
        ("+", 2, opAssoc.LEFT),
        ("-", 2, opAssoc.LEFT),
        ("*", 3, opAssoc.LEFT),
        ("/", 3, opAssoc.LEFT),
    ],
)

# Parse math expressions
expression1 = expr.parseString("2*x + 3*y")
expression2 = expr.parseString("sin(x) + cos(x)")

print("Parsed Expression 1:", expression1)
print("Parsed Expression 2:", expression2)

This example uses pyparsing to define a grammar for basic math expressions with addition, subtraction, multiplication, and division. You can customize the grammar based on your specific needs.

Choose the library that best fits your requirements, whether it's for symbolic mathematics (like sympy) or general-purpose expression parsing (like pyparsing). Always consider error handling and validation when working with user-inputted expressions.

To connect to a proxy server on Linux, you can use various methods depending on your needs and the applications you want to route through the proxy. Here's a general guide on how to connect to a proxy server on Linux using the proxychains tool:

Install proxychains:
First, you need to install the proxychains tool on your Linux system. You can install it using your package manager. For example, on Debian-based systems (like Ubuntu), you can install it using the following command:

sudo apt-get install proxychains

On Fedora-based systems, you can use:

sudo dnf install proxychains

On Arch Linux, you can use:

sudo pacman -S proxychains

Edit the proxychains.conf file:
After installing proxychains, you need to edit the proxychains.conf file to configure the proxy settings. You can find the proxychains.conf file in the /etc/proxychains directory. Open the file using a text editor like nano or vim:

sudo nano /etc/proxychains/proxychains.conf

Configure the proxy settings:
In the proxychains.conf file, you need to configure the proxy settings for your proxy server. Replace the example settings with your proxy server's IP address, port, and authentication details (if required) in the following format:

strict_chain
proxy_dns

[Proxy]
type            http
server          
port            
username        
password        

[ProxyDns]
server          
port            

Save the changes and exit the text editor.

Test the proxychains connection:
To test the connection to the proxy server using proxychains, you can use the ping command:

proxychains ping 

If the connection is successful, you should see a response from the target server.

Use proxychains with other applications:

Now that you have successfully connected to the proxy server using proxychains, you can use it with other applications by prefixing the application's command with proxychains. For example:

proxychains wget 

or

proxychains curl 

This will route the traffic from the specified application through the proxy server.

If you want to check the proxy's regionality, use a tool such as the proxy checker. You can either download the program or use it online. To perform the check, which allows you to determine not only the country and city, but also a number of other important indicators, you need to enter your username and password in the appropriate fields.

It depends on the purpose for which you plan to work with proxies at all. Personally, one is enough for myself. But if you plan to do massive parsing, it may not be enough to have 100 pieces.