title: Advanced Middleware
description: Add ASGI middleware, HTTPS redirect, trusted hosts, and GZip compression in JustAPI.
keywords: [JustAPI, middleware, ASGI, HTTPS redirect, trusted host, GZip]

Adding ASGI Middleware

JustAPI supports any ASGI middleware:

from justapi import JustAPIApp
from starlette.middleware.httpsredirect import HTTPSRedirectMiddleware
from starlette.middleware.trustedhost import TrustedHostMiddleware

app = JustAPIApp()

app.add_middleware(HTTPSRedirectMiddleware)

Trusted Host Middleware

Guard against HTTP host header attacks:

app.add_middleware(
    TrustedHostMiddleware,
    allowed_hosts=["example.com", "*.example.com"],
)

GZip Compression

from starlette.middleware.gzip import GZipMiddleware

app.add_middleware(GZipMiddleware, minimum_size=500, compresslevel=9)

Custom ASGI Middleware

Write your own middleware class:

import time
from starlette.middleware.base import BaseHTTPMiddleware

class TimingMiddleware(BaseHTTPMiddleware):
    async def dispatch(self, request, call_next):
        start = time.time()
        response = await call_next(request)
        duration = time.time() - start
        response.headers["X-Process-Time"] = str(round(duration, 4))
        return response

app.add_middleware(TimingMiddleware)

See Also

• Middleware — basic middleware usage
• Behind a Proxy — reverse proxy configuration
• Sub Applications — mounting sub-apps