fix(wasm): 优化 req header 获取

优化 PluginHttpWrapper req_header 获取方方式，避免因为不规范的 http header 导致 plugin panic，并且打印不规范的 header 日志

plugins/wasm-rust/src/plugin_wrapper.rs

@@ -17,6 +17,9 @@ use multimap::MultiMap;
 use proxy_wasm::traits::{Context, HttpContext, RootContext};
 use proxy_wasm::types::{Action, Bytes, DataAction, HeaderAction};
 use serde::de::DeserializeOwned;
+use proxy_wasm::hostcalls::log;
+use proxy_wasm::types::LogLevel;
+
 
 pub trait RootContextWrapper<PluginConfig>: RootContext
 where
@@ -143,9 +146,21 @@ where
     fn on_http_request_headers(&mut self, num_headers: usize, end_of_stream: bool) -> HeaderAction {
         let binding = self.rule_matcher.borrow();
         self.config = binding.get_match_config().map(|config| config.1.clone());
-        for (k, v) in self.get_http_request_headers() {
-            self.req_headers.insert(k, v);
+
+        for (k, v) in self.get_http_request_headers_bytes() {
+            match String::from_utf8(v) {
+                Ok(header_value) => {
+                    self.req_headers.insert(k, header_value);
+                }
+                Err(_) => {
+                    log(
+                        LogLevel::Warn,
+                        format!("http header contains non-ASCII characters header: {}", k ).as_str(),
+                    ).unwrap();
+                }
+            }
         }
+
         if let Some(config) = &self.config {
             self.http_content.on_config(config);
         }