Cleanup examples.

examples/BUILD

@@ -52,3 +52,15 @@ rust_binary(
         "//bazel/cargo:log",
     ],
 )
+
+rust_binary(
+    name = "http_config",
+    srcs = ["http_config.rs"],
+    crate_type = "cdylib",
+    edition = "2018",
+    out_binary = True,
+    deps = [
+        "//:proxy_wasm",
+        "//bazel/cargo:log",
+    ],
+)

examples/http_body.rs

@@ -30,7 +30,7 @@ impl RootContext for HttpBodyRoot {
         Some(ContextType::HttpContext)
     }
 
-    fn create_http_context(&self, _context_id: u32) -> Option<Box<dyn HttpContext>> {
+    fn create_http_context(&self, _: u32) -> Option<Box<dyn HttpContext>> {
         Some(Box::new(HttpBody))
     }
 }

examples/http_config.rs

@@ -32,7 +32,7 @@ struct HttpConfigHeader {
 impl Context for HttpConfigHeader {}
 
 impl HttpContext for HttpConfigHeader {
-    fn on_http_response_headers(&mut self, _num_headers: usize) -> Action {
+    fn on_http_response_headers(&mut self, _: usize) -> Action {
         self.add_http_response_header("custom-header", self.header_content.as_str());
         Action::Continue
     }
@@ -45,14 +45,14 @@ struct HttpConfigHeaderRoot {
 impl Context for HttpConfigHeaderRoot {}
 
 impl RootContext for HttpConfigHeaderRoot {
-    fn on_configure(&mut self, _plugin_configuration_size: usize) -> bool {
+    fn on_configure(&mut self, _: usize) -> bool {
         if let Some(config_bytes) = self.get_configuration() {
             self.header_content = String::from_utf8(config_bytes).unwrap()
         }
         true
     }
 
-    fn create_http_context(&self, _context_id: u32) -> Option<Box<dyn HttpContext>> {
+    fn create_http_context(&self, _: u32) -> Option<Box<dyn HttpContext>> {
         Some(Box::new(HttpConfigHeader {
             header_content: self.header_content.clone(),
         }))

examples/http_headers.rs

@@ -31,10 +31,8 @@ impl RootContext for HttpHeadersRoot {
         Some(ContextType::HttpContext)
     }
 
-    fn create_http_context(&self, _context_id: u32) -> Option<Box<dyn HttpContext>> {
-        Some(Box::new(HttpHeaders {
-            context_id: _context_id,
-        }))
+    fn create_http_context(&self, context_id: u32) -> Option<Box<dyn HttpContext>> {
+        Some(Box::new(HttpHeaders { context_id }))
     }
 }