```Python hl_lines="2  6"
{!../../../docs_src/advanced_middleware/tutorial001.py!}
```

## `TrustedHostMiddleware`

Enforces that all incoming requests have a correctly set `Host` header, in order to guard against HTTP Host Header attacks.

```Python hl_lines="2  6-8"
{!../../../docs_src/advanced_middleware/tutorial002.py!}
```

          else -> c.code
        }
      i++
    }
    return result
  }

  private val Int.punycodeDigit: Int
    get() =
      when {
        this < 26 -> this + 'a'.code
        this < 36 -> (this - 26) + '0'.code
        else -> error("unexpected digit: $this")
      }

		Major:      "1",
		Minor:      "24",
		GitVersion: "v1.24",
	}
	version1_25 = &version.Info{
		Major:      "1",
		Minor:      "25",
		GitVersion: "v1.25",
	}
	version1_26 = &version.Info{
		Major:      "1",
		Minor:      "26",
		GitVersion: "v1.26",
	}
	version1_19RC = &version.Info{
		Major:      "1",
		Minor:      "19",
		GitVersion: "v1.19.5-rc.0",
	}
	version1_17GKE = &version.Info{

			wantTenFields: `3389224,2,2014-03-26 00:26:15,2014-03-26 00:28:38,N,1,-73.950431823730469,40.792251586914063,-73.938949584960937,40.794425964355469,1,0.84,4.5,0.5,0.5,1,0,,,6.5,...

    }


    @Override
    protected int writeParameterWordsWireFormat ( byte[] dst, int dstIndex ) {
        int start = dstIndex;

        this.dataOffset = ( dstIndex - this.headerStart ) + 26; // 26 = off from here to pad

        this.pad = ( this.dataOffset - this.headerStart ) % 4;
        this.pad = this.pad == 0 ? 0 : 4 - this.pad;
        this.dataOffset += this.pad;

        }
        return 0;
    }
    int writeParameterWordsWireFormat( byte[] dst, int dstIndex ) {
        int start = dstIndex;

        dataOffset = (dstIndex - headerStart) + 26; // 26 = off from here to pad

pad = ( dataOffset - headerStart ) % 4;
pad = pad == 0 ? 0 : 4 - pad;
dataOffset += pad;

        writeInt2( fid, dst, dstIndex );
        dstIndex += 2;

16F01"],["SI",19,"F05F08F02"],["SK",24,"F04F06F10"],["SM",27,"U01F05F05A12"],["ST",25,"F08F11F02"],["TL",23,"F03F14F02"],["TN",24,"F02F03F13F02"],["TR",26,"F05F01A16"],["VG",24,"U04F16"],["XK",20,"F04F10F02"],["AO",25,"F21"],["BF",27,"F23"],["BI",16,"F12"],["BJ",28,"F24"],["CI",28,"U01F23"],["CM",27,"F23"],["CV",25,"F21"],["DZ",24,"F20"],["IR",26,"F22"],["JO",30,"A04F22"],["MG",27,"F23"],["ML",28,"U01F23"],["MZ",25,"F21"],["QA",29,"U04A21"],["SN",28,"U01F23"],["UA",29,"F25"]],c=function(a){a=a.r...

          .put(84, 0x3e2e58f9196abfe5L)
          .put(67, 0xd38ae3dec0107aeaL)
          .put(53, 0xea3033885868e10eL)
          .put(42, 0x1394a146d0d7e04bL)
          .put(33, 0x9962499315d2e8daL)
          .put(26, 0x0849f5cfa85489b5L)
          .put(20, 0x83b395ff19bf2171L)
          .put(16, 0x9d33dd141bd55d9aL)
          .put(12, 0x196248eb0b02466aL)
          .put(9, 0x1cf73a50ff120336L)
          .put(7, 0xb451c339457dbf51L)

This method returns a function. And that function is what will receive a request and return a response.

Here we use it to create a `GzipRequest` from the original request.

```Python hl_lines="18-26"
{!../../../docs_src/custom_request_and_route/tutorial001.py!}
```

!!! note "Technical Details"
    A `Request` has a `request.scope` attribute, that's just a Python `dict` containing the metadata related to the request.

Diese Methode gibt eine Funktion zurück. Und diese Funktion empfängt einen Request und gibt eine Response zurück.

Hier verwenden wir sie, um aus dem ursprünglichen Request einen `GzipRequest` zu erstellen.

```Python hl_lines="18-26"
{!../../../docs_src/custom_request_and_route/tutorial001.py!}
```

!!! note "Technische Details"