You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: tap.rs
    path of file: ./repos/linkerd2-proxy/linkerd/app/integration/src
    
    the code of the file until where you have to start completion: use super::*;
use futures::stream;
use http_body::Body;
use linkerd2_proxy_api::tap as pb;

pub fn client(addr: SocketAddr) -> Client {
    let api = pb::tap_client::TapClient::new(SyncSvc(client::http2(addr, "localhost")));
    Client { api }
}

pub fn client_with_auth<T: Into<String>>(addr: SocketAddr, auth: T) -> Client {
    let api = pb::tap_client::TapClient::new(SyncSvc(client::http2(addr, auth)));
    Client { api }
}

pub struct Client {
    api: pb::tap_client::TapClient<SyncSvc>,
}

impl Client {
    pub async fn observe(
        &mut self,
        req: ObserveBuilder,
    ) -> Pin<Box<dyn Stream<Item = Result<pb::TapEvent, tonic::Status>> + Send>> {
        let req = tonic::Request::new(req.0);
     
    
pub fn observe_request() -> ObserveBuilder {
    ObserveBuilder(pb::ObserveRequest {
        limit: 100,
        r#match: Some(pb::observe_request::Match {
            r#match: Some(pb::observe_request::r#match::Match::Http(
                pb::observe_request::r#match::Http {
                    r#match: Some(pb::observe_request::r#match::http::Match::Path(
                        pb::observe_request::r#match::http::StringMatch {
                            r#match: Some(
                                pb::observe_request::r#match::http::string_match::Match::Prefix(
                                    "/".to_string(),
                                ),
                            ),
                        },
                    )),
                },
            )),
        }),
        extract: Some(pb::observe_request::Extract {
            extract: Some(pb::observe_request::extract::Extract::Http(
                pb::observe_request::extract::Http {
                    extract: None, // no headers
                },
            )),
        }),
    })
}