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wasm: replace the obsolete contents in wasm's README with docs link #14628

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Jan 13, 2021
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wasm: replace the obsolete contents in wasm's README with docs link #14628

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61 changes: 2 additions & 59 deletions examples/wasm-cc/README.md
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Original file line number Diff line number Diff line change
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# Envoy WebAssembly Filter

In this example, we show how a WebAssembly(WASM) filter can be used with the Envoy
proxy. The Envoy proxy [configuration](./envoy.yaml) includes a Webassembly filter
as documented [here](https://www.envoyproxy.io/docs/envoy/latest/).
<!--TODO(bianpengyuan): change to the url of Wasm filter once the doc is ready.-->



## Quick Start

1. `docker-compose build`
2. `docker-compose up`
3. `curl -v localhost:18000`

Curl output should include our headers:

```
# <b> curl -v localhost:8000</b>
* Rebuilt URL to: localhost:18000/
* Trying 127.0.0.1...
* TCP_NODELAY set
* Connected to localhost (127.0.0.1) port 18000 (#0)
> GET / HTTP/1.1
> Host: localhost:18000
> User-Agent: curl/7.58.0
> Accept: */*
>
< HTTP/1.1 200 OK
< content-length: 13
< content-type: text/plain
< location: envoy-wasm
< date: Tue, 09 Jul 2019 00:47:14 GMT
< server: envoy
< x-envoy-upstream-service-time: 0
< newheader: newheadervalue
<
example body
* Connection #0 to host localhost left intact
```

## Build WASM Module

Now you want to make changes to the C++ filter ([envoy_filter_http_wasm_example.cc](envoy_filter_http_wasm_example.cc))
and build the WASM module ([envoy_filter_http_wasm_example.wasm](envoy_filter_http_wasm_example.wasm)).

1. Build WASM module
```shell
bazel build //examples/wasm:envoy_filter_http_wasm_example.wasm
```

## Build the Envoy WASM Image

<!--TODO(incfly): remove this once we upstream WASM to envoyproxy main repo.-->

For Envoy WASM runtime developers, if you want to make changes, please

1. Follow [instructions](https://github.com/envoyproxy/envoy-wasm/blob/master/WASM.md).
2. Modify `docker-compose.yaml` to mount your own Envoy.
To learn about this sandbox and for instructions on how to run it please head over
to the [envoy docs](https://www.envoyproxy.io/docs/envoy/latest/start/sandboxes/wasm-cc).