From 49c16dc644daf38661b006ec3ccac9aba529f6cb Mon Sep 17 00:00:00 2001
From: Xi Xu <i@xi-xu.me>
Date: Fri, 7 Nov 2025 16:34:37 +0800
Subject: [PATCH] Add detailed headers and error handling to query requests

Expanded request headers to better mimic browser requests and improve compatibility with DeepL. Added specific handling for HTTP 429 rate limit errors and enhanced general error reporting for non-200 responses.
---
 src/lib/query.ts | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/src/lib/query.ts b/src/lib/query.ts
index 294b437..131abae 100644
--- a/src/lib/query.ts
+++ b/src/lib/query.ts
@@ -325,6 +325,18 @@ async function query(
           const response = await fetch(endpoint, {
             headers: {
               "Content-Type": "application/json; charset=utf-8",
+              Accept: "*/*",
+              "Accept-Language": "en-US,en;q=0.9",
+              "Accept-Encoding": "gzip, deflate, br",
+              "Cache-Control": "no-cache",
+              Origin: "https://www.deepl.com",
+              Connection: "keep-alive",
+              Referer: "https://www.deepl.com/",
+              "Sec-Fetch-Dest": "empty",
+              "Sec-Fetch-Mode": "cors",
+              "Sec-Fetch-Site": "same-site",
+              "User-Agent":
+                "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/141.0.0.0 Safari/537.36 Edg/141.0.0.0",
               ...fingerprint,
               ...config?.customHeader,
             },
@@ -340,6 +352,32 @@ async function query(
             console.error(`400 error received. Request body was:`, requestBody);
           }
 
+          // Check for rate limit error specifically
+          if (!response.ok && response.status === 429) {
+            const error = new Error(
+              "Too many requests, your IP has been blocked by DeepL temporarily, please don't request it frequently in a short time"
+            );
+            (error as any).status = 429;
+            throw error;
+          }
+
+          // Check for other error status codes (general non-200 check)
+          if (!response.ok) {
+            let errorMessage = `Request failed with status code: ${response.status}`;
+            try {
+              const errorText = await response.text();
+              if (errorText) {
+                errorMessage += ` - ${errorText}`;
+              }
+            } catch {
+              // Ignore error when reading response body
+            }
+
+            const error = new Error(errorMessage);
+            (error as any).status = response.status;
+            throw error;
+          }
+
           return response;
         } catch (error) {
           clearTimeout(timeoutId);