tests(hostcalls) drop url dependency; improve load time

Removing the `url` crate, reduces `hostcalls` load time in Wasmtime by 25%.

t/lib/proxy-wasm-tests/hostcalls/Cargo.toml

@@ -9,7 +9,6 @@ crate-type = ["cdylib"]
 
 [dependencies]
 proxy-wasm = "0.2"
-url = "2.2"
 log = "0.4"
 http = "0.2"
 chrono = "0.4"

t/lib/proxy-wasm-tests/hostcalls/src/types/test_http.rs

@@ -3,7 +3,6 @@ use http::StatusCode;
 use log::*;
 use proxy_wasm::{traits::*, types::*};
 use std::time::Duration;
-use url::Url;
 
 pub struct TestHttp {
     pub on_phases: Vec<TestPhase>,
@@ -22,19 +21,14 @@ impl TestHttp {
 
     fn serve_echo(&mut self, path: &str) {
         if path.starts_with("/t/echo/header/") {
-            let url = Url::options()
-                .base_url(Some(&Url::parse("http://localhost").unwrap()))
-                .parse(path)
-                .expect("bad path");
-
             /* /t/echo/header/{header_name: String} */
-            let header_name = url
-                .path()
+            let header_name = path
                 .split('/')
                 .collect::<Vec<&str>>()
-                .split_off(4)
-                .pop()
-                .unwrap();
+                .remove(4)
+                .split('?')
+                .collect::<Vec<&str>>()
+                .remove(0);
 
             echo_header(self, header_name);
         }