Added initial support for PathConfig, allows setting custom error handler. (#903)

src/error.rs

@@ -92,6 +92,25 @@ impl ResponseError for JsonPayloadError {
     }
 }
 
+/// A set of errors that can occur during parsing request paths
+#[derive(Debug, Display, From)]
+pub enum PathPayloadError {
+    /// Deserialize error
+    #[display(fmt = "Path deserialize error: {}", _0)]
+    Deserialize(de::Error),
+}
+
+/// Return `BadRequest` for `PathPayloadError`
+impl ResponseError for PathPayloadError {
+    fn error_response(&self) -> HttpResponse {
+        match *self {
+            PathPayloadError::Deserialize(_) => {
+                HttpResponse::new(StatusCode::BAD_REQUEST)
+            }
+        }
+    }
+}
+
 /// A set of errors that can occur during parsing query strings
 #[derive(Debug, Display, From)]
 pub enum QueryPayloadError {