How to Fix Proxy Errors

DodaTech Updated 2026-06-26 1 min read

In this tutorial, you'll learn about How to Fix Proxy Errors. We cover key concepts, practical examples, and best practices.

Fix proxy errors when expensive object created before needed or access control duplicated everywhere.

Quick Fix

Wrong

class HeavyImage:
    def __init__(self,path):
        self.path=path; self._load()
    def _load(self): print(f'Loading {self.path}...')
    def display(self): print(f'Display {self.path}')
img=HeavyImage('photo.jpg')  # loads even if never displayed!

Heavy object initialized eagerly. Wastes resources if never used.

Right

class HeavyImage:
    def __init__(self,path):
        self.path=path
    def _load(self): print(f'Loading {self.path}...')
    def display(self): print(f'Display {self.path}')
class ImageProxy:
    def __init__(self,path):
        self.path=path; self._real=None
    def display(self):
        if self._real is None:
            self._real=HeavyImage(self.path)
            self._real._load()
        self._real.display()
img=ImageProxy('photo.jpg')  # no load yet
img.display()  # loads on demand

HeavyImage loaded only when display() is first called. Proxy controls access.

Prevention

Proxy controls access to real object. Lazy initialization, access control, logging, caching.

DodaTech Tools

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FAQ

What is Proxy?

Surrogate controlling access to another object. Same interface as real subject.

Types?

Virtual proxy (lazy init), protection proxy (access control), remote proxy (network), cache proxy.

Example?

Python @property, Django ORM lazy queries, ORM lazy loading.

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