Feb 13, 2020
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www.airsoftgi.com
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API Middlewares â The Bouncer at the Door (FastAPI & ASGI) (2026)
Understanding Middleware in Backend Architecture
When building robust backend systems, it's essential to consider the security and integrity of the data being exchanged. One crucial aspect of achieving this is by implementing middleware. In this context, middleware refers to a layer of code that intercepts every incoming request to the application, inspecting it before deciding whether to pass it through to the core logic or reject it.
The Onion Architecture Analogy
Imagine your web server as an onion, with multiple layers. The core of the onion represents your business logic, such as fetching user data or processing orders. The outer layers are where the middleware resides. Each incoming request must pass through these outer layers before reaching the core. This design ensures that security checks and other essential processes are applied uniformly across all requests.
Inbound and Outbound Processing
Middleware functions can be thought of as having two phases: inbound and outbound.
Inbound Phase: When a request first arrives, the middleware checks it against certain criteria, such as the client's IP address or the presence of a valid token. If the request passes these checks, it is allowed to proceed to the next layer.
The Handoff: After passing the inbound checks, the request is yielded to the application's router, which directs it to the appropriate endpoint. The endpoint processes the request and generates a response.
Outbound Phase: As the response is sent back, the middleware catches it and can modify it if necessary. This might involve adding security headers or logging the response time.
Implementing Middleware with FastAPI and Starlette
In a production environment, you wouldn't typically write raw network intercepts. Instead, you would use the tools provided by the ASGI (Asynchronous Server Gateway Interface) specification. For FastAPI applications, you can build middleware by inheriting from Starlette's BaseHTTPMiddleware. This approach allows you to create a "bouncer" that protects your application from unwanted requests.
from fastapi import FastAPI, Request, Response from starlette.middleware.base import BaseHTTPMiddleware app = FastAPI() BLOCKED_IPS = ["192.168.1.50"] class SecurityBouncer(BaseHTTPMiddleware): async def dispatch(self, request: Request, call_next): client_ip = request.client.host if client_ip in BLOCKED_IPS: return Response(content="Banned", status_code=403) response = await call_next(request) response.headers["X-Frame-Options"] = "DENY" return response app.add_middleware(SecurityBouncer)
This example demonstrates how to create a simple middleware that checks the client's IP address and adds a security header to the response.
The Importance of Middleware Order
The order in which middleware is added to an application can significantly impact its behavior. Middleware functions stack on top of each other, with the last one added being the first to execute. This means you should carefully consider the order in which you add middleware to ensure that your application's security and functionality are not compromised.
Best Practices for Middleware Development
When developing middleware, it's crucial to keep in mind the following best practices:
Keep it Fast: Middleware should execute quickly to avoid slowing down the entire application.
Avoid Blocking Operations: Synchronous operations within middleware can block the execution of other requests, leading to performance issues.
Test Thoroughly: Ensure that your middleware is thoroughly tested to catch any potential issues before they reach production.
By following these guidelines and understanding the role of middleware in your backend architecture, you can build more secure, scalable, and maintainable applications.
Read the full technical breakdown on my blog
Python en 2025 : pourquoi le langage reprend sa place dans le développement web
Python en 2025 : le grand retour du dĂ©veloppement web đ Tendances web 2025 Python revient sur le web : plus rapide, plus simple⊠et prĂȘt pour lâIA AprĂšs quelques saisons dominĂ©es par JavaScript, Python signe un come-back web convaincant. Entre frameworks modernisĂ©s, async natif, et passerelles IA, le serpent a retrouvĂ© ses crocs. Par Audryk Chesse â New_Technology đ Pourquoi ce retourâŠ
Right to enter Italy for those who have been unlawfully pushed back to Bosnia
The following case note was published by ASGI on 22 January 2021. The Association for Juridical Studies on Immigration (ASGI) is a membership-based association focusing on all legal aspects of immigration.
A foreign citizen, illegally readmitted to Slovenia and then to Bosnia on the basis of the Italy-Slovenia agreement, has the right to immediately enter Italy to seek asylum, in application of article 10 of our Constitution, while the Italy-Slovenia agreement violates international, European and Italian law.
This is the outcome of a decision in a summary proceedings, issued on [18 January 2021] by the Court of Rome, which accepted the urgent appeal filed by a Pakistani citizen, asylum seeker, transferred in July 2020 from Italy to Slovenia, to Croatia and then to Bosnia, according to an established Statesâ practice of chain readmissions.
With this decision, the Court sanctioned the illegality of the readmission procedure implemented on the Italian eastern border on the basis of an agreement signed between Italy and Slovenia in 1996, which was never ratified by the Italian Parliament.
The Court highlighted that this procedure is conducted in clear violation of international, European and Italian rules related to the access to asylum procedures. As a matter of fact, the asylum seeker has not been issued any official decision and his individual conditions have not been examined. Therefore the right of defense and the right to lodge an effective remedy were clearly violated.
Furthermore, the procedure included detention, which was carried out without any review by a judicial authority. Finally, the procedure infringed the obligation of non-refoulement which prohibits exposing people to risks of inhuman and degrading treatment, which, as documented by many NGOs including the Border Violence Monitoring network, is constantly present on the Croatian border.
In direct application of art. 10 paragraph 3 of the Italian Constitution, the Court recognized the applicantâs right to enter Italy immediately in order to have access to the asylum procedure, previously precluded due to the unlawful conduct of the Italian authorities.
This result was obtained by ASGIâs lawyers Caterina Bove and Anna Brambilla, thanks to the testimonies collected by the Border Violence Monitoring Network (BVNN) and by the journalist Martin Gottske, and thanks to the collaboration with all the organizations involved in documenting and countering the violence along the Balkan route. This ordinance represents a fundamental step for the rehabilitation of legality on the Italian eastern border. [Read more here.]
Soros-Geldregen fĂŒr Italien: Einfluss auf Einwanderungspolitik und Wahlen
Soros-Geldregen fĂŒr Italien: Einfluss auf Einwanderungspolitik und Wahlen
8,5 MILLIONEN US-DOLLAR Zwischen 2017 und 2018 lieĂ die Open Society Foundations des US-MultimilliardĂ€rs und begnadeten Spekulanten, George Soros, 8,5 Mio. US-Dollar nach Italien flieĂen. Das brisante Papier mit allen Details, an wen die Geldsummen flossen, wurde kĂŒrzlich von der italienischen Presseagentur Adnkronos veröffentlicht und die auf der Liste aufscheinenden KĂŒrzel der EmpfĂ€nger entlarvt.
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France : livraison de bateaux Ă la Libye : le juge se dĂ©robe. LâimpunitĂ© pour les « actes de gouvernement », jusquâĂ quand ?
En fĂ©vrier 2019, la ministre des ArmĂ©es a annoncĂ© lâachat par la France de six embarcations rapides au profit des garde-cĂŽtes libyens pour faire face au « problĂšme de lâimmigration clandestine ».
Huit associations : Amnesty, MSF, le Gisti, la LdH, la Cimade, Migreurop, lâASGI (association italienne) et Avocats sans frontiĂšres ont saisi au mois dâavril 2019 le tribunal administratif de ParisâŠ
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DL sicurezza: le criticitĂ sui migranti â scheda Si Ăš chiuso questa settimana il ciclo di audizioni sul dl Sicurezza, in fase di conversione in Affari costituzionali al Senato.