mode=edge网关调用失败

mesher是master分支版本

mesher.yaml文件：
```yaml
mesher:
ingress:
type: servicecomb
rule:
http: |
- host: example.com
apiPath: /sayhello/peter
service:
name: RESTServer
```
service:
```json
{
"serviceId": "df61d6a27f81b5d2d7e7a76948d6af34fc40cf2c",
"appId": "default",
"serviceName": "RESTServer",
"version": "0.0.1",
"level": "BACK",
"schemas": [
"RESTServer"
],
"status": "UP",
"timestamp": "1605178252",
"alias": "default:RESTServer",
"modTimestamp": "1605178252",
"registerBy": "SDK",
"framework": {
"name": "Go-Chassis",
"version": "v2.0.2"
}
}
```
执行命令：
```
http_proxy=http://127.0.0.1:30101 curl 'http://example.com/sayhello/peter'
curl: (52) Empty reply from server
```

mesher日志：
```
{"level":"ERROR","timestamp":"2020-11-13 12:07:08.461 +08:00","file":"handler/transport_handler.go:53","msg":"call err [Get \"http://example.com/sayhello/peter\": http: Request.RequestURI can't be set in client requests]"}
2020/11/13 12:07:08 http: panic serving 127.0.0.1:54562: invalid WriteHeader code 0
```

不清楚是哪里设置不对，还是执行curl命令不对？