fix: propagate response for failed fallbacks

src/handlers/chatCompletionsHandler.ts

@@ -26,14 +26,6 @@ export async function chatCompletionsHandler(c: Context): Promise<Response> {
             "config"
         );
 
-        if (!tryTargetsResponse) {
-            return new Response(errors[errors.length - 1].errorObj, {
-                status: errors[errors.length - 1].status,
-                headers: {
-                    "content-type": "application/json"
-                }
-            });
-        }
         return tryTargetsResponse;
     } catch (err: any) {
         console.log("chatCompletion error", err.message);

src/handlers/completionsHandler.ts

@@ -27,14 +27,6 @@ export async function completionsHandler(c: Context): Promise<Response> {
             "config"
         );
 
-        if (!tryTargetsResponse) {
-            return new Response(errors[errors.length - 1].errorObj, {
-                status: errors[errors.length - 1].status,
-                headers: {
-                    "content-type": "application/json"
-                }
-            });
-        }
         return tryTargetsResponse;
     } catch (err: any) {
         console.log("completion error", err.message);

src/handlers/embeddingsHandler.ts

@@ -28,14 +28,6 @@ export async function embeddingsHandler(c: Context): Promise<Response> {
             "config"
         );
 
-        if (!tryTargetsResponse) {
-            return new Response(errors[errors.length - 1].errorObj, {
-                status: errors[errors.length - 1].status,
-                headers: {
-                    "content-type": "application/json"
-                }
-            });
-        }
         return tryTargetsResponse;
     } catch (err: any) {
         console.log("completion error", err.message);

src/handlers/handlerUtils.ts

@@ -429,8 +429,9 @@ export async function tryPost(c: Context, providerOption:Options, inputParams: P
   // If the response was not ok, throw an error
   if (!response.ok) {
     // Check if this request needs to be retried
-    const errorObj: any = new Error(await mappedResponse.text());
+    const errorObj: any = new Error(await mappedResponse.clone().text());
     errorObj.status = mappedResponse.status;
+    errorObj.response = mappedResponse
     throw errorObj;
   }
 
@@ -502,7 +503,7 @@ export async function tryTargetsRecursively(
     errors: any,
     jsonPath: string,
     inheritedConfig: Record<string, any> = {}
-): Promise<Response | undefined> {
+): Promise<Response> {
     let currentTarget: any = {...targetGroup};
     let currentJsonPath = jsonPath;
     const strategyMode = currentTarget.strategy?.mode;
@@ -614,6 +615,7 @@ export async function tryTargetsRecursively(
                 currentJsonPath
             );
           } catch (error: any) {
+            response = error.response;
             errors.push({
                 provider: targetGroup.provider,
                 errorObj: error.message,