fix handling of "not found" errors

HTTP 500 were returned instead of HTTP 404

Author: lovasoa

src/webserver/http.rs

@@ -21,7 +21,7 @@ use futures_util::StreamExt;
 use std::borrow::Cow;
 use std::collections::hash_map::Entry;
 use std::collections::HashMap;
-use std::io::{self, Write};
+use std::io::Write;
 use std::mem;
 use std::net::IpAddr;
 use std::path::PathBuf;
@@ -405,7 +405,11 @@ async fn process_sql_request(
         .await
         .map_err(|e| {
             log::error!("Error while trying to get SQL file: {:#}", e);
-            if e.downcast_ref().map(io::Error::kind) == Some(io::ErrorKind::NotFound) {
+            if e.downcast_ref()
+                == Some(&ErrorWithStatus {
+                    status: StatusCode::NOT_FOUND,
+                })
+            {
                 ErrorNotFound("The requested file was not found.")
             } else {
                 ErrorInternalServerError(format!(