feat: import

.gitignore

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+
+*.log
+
+# virtualenv
+.venv
+venv/
+ENV/
+.vscode
+.idea/
+
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class

README.md

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+# pydantic mod-wsgi bug
+
+This repository is a minimal reproduction of a bug that occurs when using some pydantic features with mod-wsgi.
+
+This was tested on a Windows machine, with `mod-wsgi==4.9.2`, Python 3.9.9, apache 2.4.57.0
+
+Also tested with Python 3.11 and bug still exists. Tried also `mod_wsgi==5.0.2`.
+
+## Installation
+- Get a Windows apache release from https://www.apachelounge.com/download/
+- Place your installation at C:/Apache24
+
+Then, install mod-wsgi (Requires VS build tools):
+```bash
+pip install mod-wsgi==4.9.2
+```
+
+```bash
+pip install -r requirements.txt
+```
+
+### Configure apache
+- Open `apache24-django.conf` and replace APP_ROOT to the absolute path of the wsgi.py folder, e.g:  
+`DEFINE WSGI_ROOT "C:/your_workspace/pydantic_mod_wsgi_bug/pydantic_mod_wsgi_bug"`
+- If you don't use python 3.9 run `mod_wsgi-express module-config` and replace the three lines in `apache24-django.conf` with the output of the command. 
+
+- Start apache server
+
+## Run
+Try the endpoints with django dev server, where they will all work:
+`python manage.py runserver`
+- Browse to `http://localhost:8000/docs`
+
+
+Then, try the endpoints with apache server, where some of the endpoints will fail:
+- Browser to `http://localhost/docs`
+The endpoints with string strip and string constraints, will hang, and will actually cause apache to crash. 
+- (Check apache error.log, you will see the server has crashed and restarted)

apache24-django.conf

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+###############################
+# For Apache 2.4.x
+###############################
+
+
+## Output from mod_wsgi-express module-config:
+# If you don't use python3.9, replace with the output you got from running 'mod_wsgi-express module-config'
+LoadFile "C:/Python39/python39.dll"
+LoadModule wsgi_module "C:/Python39/lib/site-packages/mod_wsgi/server/mod_wsgi.cp39-win_amd64.pyd"
+WSGIPythonHome "C:/Python39"
+## end of output from mod_wsgi-express module-config
+
+
+WSGIApplicationGroup %{GLOBAL}
+WSGIPassAuthorization On
+
+
+# This reduce the default 'Server' header sent by apache, to only send Server: Apache
+ServerName localhost
+ServerTokens ProductOnly
+ServerSignature Off
+
+
+# Replace here: Set this variable to the folder where wsgi.py is located
+DEFINE WSGI_ROOT "C:/Asaf/pydantic_mod_wsgi_bug/pydantic_mod_wsgi_bug"
+
+<IfModule alias_module>
+	<Directory "${WSGI_ROOT}">
+		<Files wsgi.py>
+			Require all granted
+		</Files>
+	</Directory>
+
+	WSGIScriptAlias / "${WSGI_ROOT}/wsgi.py"
+</IfModule>
+
+
+# Compression of file types, for faster download. requires mod_deflate
+<IfModule deflate_module>
+    AddOutputFilterByType DEFLATE text/plain text/html text/css application/javascript application/x-javascript
+</IfModule>
+
+
+
+LoadModule evasive_module modules/mod_evasive.so
+<IfModule evasive_module>
+    DOSEnabled  true
+    DOSHashTableSize 3097
+    DOSPageCount 4
+    DOSSiteCount 50
+    DOSPageInterval 1
+    DOSSiteInterval 1
+    DOSBlockingPeriod 10
+ </IfModule>
+
+
+<VirtualHost *:80>
+	RewriteEngine off
+	RewriteCond %{HTTPS} off
+	RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI}
+</VirtualHost>

app/admin.py

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+from django.contrib import admin
+
+# Register your models here.

app/apps.py

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+from django.apps import AppConfig
+
+
+class AppConfig(AppConfig):
+    default_auto_field = "django.db.models.BigAutoField"
+    name = "app"

app/models.py

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+from django.db import models
+
+# Create your models here.

app/tests.py

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+from django.test import TestCase
+
+# Create your tests here.

app/views.py

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+from typing import Annotated
+
+from ninja import NinjaAPI, Form
+from pydantic import ConfigDict, BaseModel, StringConstraints
+
+router = NinjaAPI()
+
+
+class PayloadString(BaseModel):
+    # This works with apache
+    string: str
+
+
+class PayloadStringStrip(BaseModel):
+    # This will fail with apache
+    string: str
+
+    model_config = ConfigDict(str_strip_whitespace=True)
+
+
+class PayLoadStringConstraints(BaseModel):
+    number: Annotated[str, StringConstraints(pattern=r"^0\d\d$", strip_whitespace=True)]
+
+
+
+@router.post("/payload_string")
+def payload_string(request, payload: Form[PayloadString]):
+    # Works with no issues
+    return {"status": "OK", "payload": payload.model_dump()}
+
+
+@router.post("/payload_string_strip")
+def payload_string_strip(request, payload: Form[PayloadStringStrip]):
+    # Won't work in apache
+    return {"status": "OK", "payload": payload.model_dump()}
+
+
+
+@router.post("/payload_string_constraints")
+def payload_string_constraints(request, payload: Form[PayLoadStringConstraints]):
+    # This works only if you input a non-valid number, e.g '11'. For a valid input like '123', apache will freeze
+    return {"status": "OK", "payload": payload.model_dump()}

manage.py

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+#!/usr/bin/env python
+"""Django's command-line utility for administrative tasks."""
+import os
+import sys
+
+
+def main():
+    """Run administrative tasks."""
+    os.environ.setdefault("DJANGO_SETTINGS_MODULE", "pydantic_mod_wsgi_bug.settings")
+    try:
+        from django.core.management import execute_from_command_line
+    except ImportError as exc:
+        raise ImportError(
+            "Couldn't import Django. Are you sure it's installed and "
+            "available on your PYTHONPATH environment variable? Did you "
+            "forget to activate a virtual environment?"
+        ) from exc
+    execute_from_command_line(sys.argv)
+
+
+if __name__ == "__main__":
+    main()

pydantic_mod_wsgi_bug/asgi.py

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+"""
+ASGI config for pydantic_mod_wsgi_bug project.
+
+It exposes the ASGI callable as a module-level variable named ``application``.
+
+For more information on this file, see
+https://docs.djangoproject.com/en/4.1/howto/deployment/asgi/
+"""
+
+import os
+
+from django.core.asgi import get_asgi_application
+
+os.environ.setdefault("DJANGO_SETTINGS_MODULE", "pydantic_mod_wsgi_bug.settings")
+
+application = get_asgi_application()

pydantic_mod_wsgi_bug/settings.py

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+"""
+Django settings for pydantic_mod_wsgi_bug project.
+
+Generated by 'django-admin startproject' using Django 4.1.12.
+
+For more information on this file, see
+https://docs.djangoproject.com/en/4.1/topics/settings/
+
+For the full list of settings and their values, see
+https://docs.djangoproject.com/en/4.1/ref/settings/
+"""
+
+from pathlib import Path
+
+# Build paths inside the project like this: BASE_DIR / 'subdir'.
+BASE_DIR = Path(__file__).resolve().parent.parent
+
+
+# Quick-start development settings - unsuitable for production
+# See https://docs.djangoproject.com/en/4.1/howto/deployment/checklist/
+
+# SECURITY WARNING: keep the secret key used in production secret!
+SECRET_KEY = "django-insecure-*yu4s3b=@y^&2$hlm#(xmt4h4+k3kvx$lb(4w&&gdp7gt^1=dj"
+
+# SECURITY WARNING: don't run with debug turned on in production!
+DEBUG = True
+
+ALLOWED_HOSTS = []
+
+
+# Application definition
+
+INSTALLED_APPS = [
+    "django.contrib.admin",
+    "django.contrib.auth",
+    "django.contrib.contenttypes",
+    "django.contrib.sessions",
+    "django.contrib.messages",
+    "django.contrib.staticfiles",
+]
+
+MIDDLEWARE = [
+    "django.middleware.security.SecurityMiddleware",
+    "django.contrib.sessions.middleware.SessionMiddleware",
+    "django.middleware.common.CommonMiddleware",
+    "django.middleware.csrf.CsrfViewMiddleware",
+    "django.contrib.auth.middleware.AuthenticationMiddleware",
+    "django.contrib.messages.middleware.MessageMiddleware",
+    "django.middleware.clickjacking.XFrameOptionsMiddleware",
+]
+
+ROOT_URLCONF = "pydantic_mod_wsgi_bug.urls"
+
+TEMPLATES = [
+    {
+        "BACKEND": "django.template.backends.django.DjangoTemplates",
+        "DIRS": [],
+        "APP_DIRS": True,
+        "OPTIONS": {
+            "context_processors": [
+                "django.template.context_processors.debug",
+                "django.template.context_processors.request",
+                "django.contrib.auth.context_processors.auth",
+                "django.contrib.messages.context_processors.messages",
+            ],
+        },
+    },
+]
+
+WSGI_APPLICATION = "pydantic_mod_wsgi_bug.wsgi.application"
+
+
+# Database
+# https://docs.djangoproject.com/en/4.1/ref/settings/#databases
+
+DATABASES = {
+    "default": {
+        "ENGINE": "django.db.backends.sqlite3",
+        "NAME": BASE_DIR / "db.sqlite3",
+    }
+}
+
+
+# Password validation
+# https://docs.djangoproject.com/en/4.1/ref/settings/#auth-password-validators
+
+AUTH_PASSWORD_VALIDATORS = [
+    {
+        "NAME": "django.contrib.auth.password_validation.UserAttributeSimilarityValidator",
+    },
+    {
+        "NAME": "django.contrib.auth.password_validation.MinimumLengthValidator",
+    },
+    {
+        "NAME": "django.contrib.auth.password_validation.CommonPasswordValidator",
+    },
+    {
+        "NAME": "django.contrib.auth.password_validation.NumericPasswordValidator",
+    },
+]
+
+
+# Internationalization
+# https://docs.djangoproject.com/en/4.1/topics/i18n/
+
+LANGUAGE_CODE = "en-us"
+
+TIME_ZONE = "UTC"
+
+USE_I18N = True
+
+USE_TZ = True
+
+
+# Static files (CSS, JavaScript, Images)
+# https://docs.djangoproject.com/en/4.1/howto/static-files/
+
+STATIC_URL = "static/"
+
+# Default primary key field type
+# https://docs.djangoproject.com/en/4.1/ref/settings/#default-auto-field
+
+DEFAULT_AUTO_FIELD = "django.db.models.BigAutoField"

pydantic_mod_wsgi_bug/urls.py

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+"""pydantic_mod_wsgi_bug URL Configuration
+
+The `urlpatterns` list routes URLs to views. For more information please see:
+    https://docs.djangoproject.com/en/4.1/topics/http/urls/
+Examples:
+Function views
+    1. Add an import:  from my_app import views
+    2. Add a URL to urlpatterns:  path('', views.home, name='home')
+Class-based views
+    1. Add an import:  from other_app.views import Home
+    2. Add a URL to urlpatterns:  path('', Home.as_view(), name='home')
+Including another URLconf
+    1. Import the include() function: from django.urls import include, path
+    2. Add a URL to urlpatterns:  path('blog/', include('blog.urls'))
+"""
+
+from django.contrib import admin
+from django.urls import path
+
+from app import views
+
+urlpatterns = [
+    path("", views.router.urls),
+]

pydantic_mod_wsgi_bug/wsgi.py

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+"""
+WSGI config for pydantic_mod_wsgi_bug project.
+
+It exposes the WSGI callable as a module-level variable named ``application``.
+
+For more information on this file, see
+https://docs.djangoproject.com/en/4.1/howto/deployment/wsgi/
+"""
+
+import os
+import sys
+
+from django.core.wsgi import get_wsgi_application
+
+sys.path.append(os.path.dirname(os.path.dirname(__file__)))
+os.environ.setdefault("DJANGO_SETTINGS_MODULE", "pydantic_mod_wsgi_bug.settings")
+
+application = get_wsgi_application()