Merge pull request #217 from cr0hn/patch-3

Upgraded Middlewares doc: Explain how to chain two (or more) middlewares
This commit is contained in:
Eli Uriegas 2016-12-23 22:31:03 -08:00 committed by GitHub
commit 665881471d

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@ -27,3 +27,23 @@ async def handler(request):
app.run(host="0.0.0.0", port=8000)
```
## Middleware chain
If you want to apply the middleware as a chain, applying more than one, is so easy. You only have to be aware that you do **not return** any response in your middleware:
```python
app = Sanic(__name__)
@app.middleware('response')
async def custom_banner(request, response):
response.headers["Server"] = "Fake-Server"
@app.middleware('response')
async def prevent_xss(request, response):
response.headers["x-xss-protection"] = "1; mode=block"
app.run(host="0.0.0.0", port=8000)
```
The above code will apply the two middlewares in order. First the middleware **custom_banner** will change the HTTP Response headers *Server* by *Fake-Server*, and the second middleware **prevent_xss** will add the HTTP Headers for prevent Cross-Site-Scripting (XSS) attacks.