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delete outdated content (#3486) 

Signed-off-by: zhangchao <zchao9100@gmail.com>
Co-authored-by: Mark Fussell <markfussell@gmail.com>
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daprdocs/content/en/reference/components-reference/supported-middleware/middleware-wasm.md
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@ -116,41 +116,6 @@ If using TinyGo, compile as shown below and set the spec metadata field named
tinygo build -o router.wasm -scheduler=none --no-debug -target=wasi router.go`
```
### Generating Wasm
This component allows you to rewrite a request URI with custom logic compiled
to a Wasm using the waPC protocol. The `rewrite` function receives the request
URI and returns an update as necessary.
To compile your Wasm, you must compile source using a waPC guest SDK such as
[TinyGo](https://github.com/wapc/wapc-guest-tinygo).
Here's an example in TinyGo:
```go
package main
import "github.com/wapc/wapc-guest-tinygo"
func main() {
wapc.RegisterFunctions(wapc.Functions{"rewrite": rewrite})
}
// rewrite returns a new URI if necessary.
func rewrite(requestURI []byte) ([]byte, error) {
if string(requestURI) == "/v1.0/hi" {
return []byte("/v1.0/hello"), nil
}
return requestURI, nil
}
```
If using TinyGo, compile as shown below and set the spec metadata field named
"url" to the location of the output (for example, `file://example.wasm`):
```bash
tinygo build -o example.wasm -scheduler=none --no-debug -target=wasi example.go
```
## Related links