Fix DNS resolution error when using add_init_script()

[rjadr]

Problem

When calling page.add_init_script(), subsequent page.goto() calls fail with ERR_NAME_NOT_RESOLVED.

Reproduction

from patchright.async_api import async_playwright

async with async_playwright() as p:
    browser = await p.chromium.launch()
    page = await browser.new_page()
    
    # This breaks navigation
    await page.add_init_script("console.log('test');")
    
    # This fails with ERR_NAME_NOT_RESOLVED
    await page.goto('https://example.com')  # ❌ Fails

Impact

This bug affects:

• Any code using add_init_script() for anti-detection (stealth scripts)
• Tools like TikTokApi that inject stealth scripts before navigation
• All users attempting to use init scripts, particularly on macOS

Root Cause

The install_inject_route() method in the patching script creates a route handler that redirects document requests to:

url=f"{protocol}://patchright-init-script-inject.internal/"

The .internal domain is not a valid TLD and cannot be resolved by DNS, causing ERR_NAME_NOT_RESOLVED.

Solution

Modified the route handler in patch_python_package.py to use route.continue_() instead of redirecting to a fake domain:

Before (broken):

if route.request.resource_type == "document" and route.request.url.startswith("http"):
    protocol = route.request.url.split(":")[0]
    await route.fallback(url=f"{protocol}://patchright-init-script-inject.internal/")

After (fixed):

if route.request.resource_type == "document" and route.request.url.startswith("http"):
    # Fix: Remove redirect to non-existent .internal domain
    await route.continue_()

This allows init scripts to be added without breaking DNS resolution.

Checklist

• Bug fix (non-breaking change which fixes an issue)
• Preserves existing init script functionality
• No breaking changes
• Works on macOS ARM64

Additional Context

This was discovered while using PyTok (which uses TikTokApi stealth scripts). The bug prevented any navigation after calling add_init_script(), making stealth functionality completely unusable. The fix has been tested locally and confirmed to work.