Fix compile error when target is wasm and multipart feature is enabled. (#1296)

src/wasm/request.rs

@@ -92,14 +92,18 @@ impl Request {
 
     /// Attempts to clone the `Request`.
     ///
-    /// None is returned if a body is which can not be cloned. This method
-    /// currently always returns `Some`, but that may change in the future.
+    /// None is returned if a body is which can not be cloned.
     pub fn try_clone(&self) -> Option<Request> {
+        let body = match self.body.as_ref() {
+            Some(ref body) => Some(body.try_clone()?),
+            None => None,
+        };
+
         Some(Self {
             method: self.method.clone(),
             url: self.url.clone(),
             headers: self.headers.clone(),
-            body: self.body.as_ref().map(|body| body.clone()),
+            body,
             cors: self.cors,
             credentials: self.credentials.clone(),
         })
@@ -353,8 +357,7 @@ impl RequestBuilder {
 
     /// Attempt to clone the RequestBuilder.
     ///
-    /// `None` is returned if the RequestBuilder can not be cloned. This method
-    /// currently always returns `Some`, but that may change in the future.
+    /// `None` is returned if the RequestBuilder can not be cloned.
     ///
     /// # Examples
     ///