fix(llm): update default providers and fix proxy header forwarding

- Default LLM provider: MiniMax (M2.5 via Anthropic-compatible API)
- Default image gen provider: Gemini (nano-banana-2 / gemini-3.1-flash-image-preview)
- Route MiniMax through Anthropic chat format
- Remove proxy header whitelist, forward all headers by default

Author: MinimaxLanbo

apps/webuiapps/src/components/ChatPanel/index.module.scss

@@ -190,6 +190,13 @@
   }
 }
 
+.modelHint {
+  display: block;
+  font-size: 11px;
+  color: rgba(250, 234, 95, 0.7);
+  margin-top: 4px;
+}
+
 .select {
   appearance: none;
   cursor: pointer;

apps/webuiapps/src/components/ChatPanel/index.tsx

@@ -508,22 +508,22 @@ const SettingsModal: React.FC<{
   onSave: (_config: LLMConfig, _igConfig: ImageGenConfig | null) => void;
   onClose: () => void;
 }> = ({ config, imageGenConfig, onSave, onClose }) => {
-  const [provider, setProvider] = useState<LLMProvider>(config?.provider || 'openai');
+  const [provider, setProvider] = useState<LLMProvider>(config?.provider || 'minimax');
   const [apiKey, setApiKey] = useState(config?.apiKey || '');
-  const [baseUrl, setBaseUrl] = useState(config?.baseUrl || getDefaultConfig('openai').baseUrl);
-  const [model, setModel] = useState(config?.model || getDefaultConfig('openai').model);
+  const [baseUrl, setBaseUrl] = useState(config?.baseUrl || getDefaultConfig('minimax').baseUrl);
+  const [model, setModel] = useState(config?.model || getDefaultConfig('minimax').model);
   const [customHeaders, setCustomHeaders] = useState(config?.customHeaders || '');
 
   // Image generation settings
   const [igProvider, setIgProvider] = useState<ImageGenProvider>(
-    imageGenConfig?.provider || 'openai',
+    imageGenConfig?.provider || 'gemini',
   );
   const [igApiKey, setIgApiKey] = useState(imageGenConfig?.apiKey || '');
   const [igBaseUrl, setIgBaseUrl] = useState(
-    imageGenConfig?.baseUrl || getDefaultImageGenConfig('openai').baseUrl,
+    imageGenConfig?.baseUrl || getDefaultImageGenConfig('gemini').baseUrl,
   );
   const [igModel, setIgModel] = useState(
-    imageGenConfig?.model || getDefaultImageGenConfig('openai').model,
+    imageGenConfig?.model || getDefaultImageGenConfig('gemini').model,
   );
   const [igCustomHeaders, setIgCustomHeaders] = useState(imageGenConfig?.customHeaders || '');
 
@@ -612,7 +612,7 @@ const SettingsModal: React.FC<{
             onChange={(e) => handleIgProviderChange(e.target.value as ImageGenProvider)}
           >
             <option value="openai">OpenAI (DALL-E)</option>
-            <option value="gemini">Gemini</option>
+            <option value="gemini">Gemini (nano-banana-2)</option>
           </select>
         </div>
 
@@ -643,6 +643,9 @@ const SettingsModal: React.FC<{
             value={igModel}
             onChange={(e) => setIgModel(e.target.value)}
           />
+          {igProvider === 'gemini' && igModel === 'gemini-3.1-flash-image-preview' && (
+            <span className={styles.modelHint}>nano-banana-2</span>
+          )}
         </div>
 
         <div className={styles.field}>

apps/webuiapps/src/lib/imageGenClient.ts

@@ -29,7 +29,7 @@ const DEFAULT_CONFIGS: Record<ImageGenProvider, Omit<ImageGenConfig, 'apiKey'>>
   gemini: {
     provider: 'gemini',
     baseUrl: 'https://generativelanguage.googleapis.com',
-    model: 'gemini-2.0-flash-exp',
+    model: 'gemini-3.1-flash-image-preview',
   },
 };
 
@@ -126,7 +126,7 @@ async function generateImageGemini(
   prompt: string,
   config: ImageGenConfig,
 ): Promise<ImageGenResult> {
-  const targetUrl = `${config.baseUrl}/v1beta/models/${config.model}:generateContent?key=${config.apiKey}`;
+  const targetUrl = `${config.baseUrl}/v1beta/models/${config.model}:generateContent`;
   const body = {
     contents: [{ parts: [{ text: prompt }] }],
     generationConfig: {
@@ -138,6 +138,7 @@ async function generateImageGemini(
     method: 'POST',
     headers: {
       'Content-Type': 'application/json',
+      'x-goog-api-key': config.apiKey,
       'X-LLM-Target-URL': targetUrl,
       ...parseCustomHeaders(config.customHeaders),
     },

apps/webuiapps/src/lib/llmClient.ts

@@ -75,7 +75,11 @@ const DEFAULT_CONFIGS: Record<LLMProvider, Omit<LLMConfig, 'apiKey'>> = {
     baseUrl: 'https://api.anthropic.com',
     model: 'claude-sonnet-4-20250514',
   },
-  minimax: { provider: 'minimax', baseUrl: 'https://api.minimax.chat', model: 'MiniMax-M1-80k' },
+  minimax: {
+    provider: 'minimax',
+    baseUrl: 'https://api.minimax.io/anthropic',
+    model: 'MiniMax-M2.5',
+  },
 };
 
 export function getDefaultConfig(provider: LLMProvider): Omit<LLMConfig, 'apiKey'> {
@@ -111,7 +115,7 @@ export async function chat(
     'messages:',
     messages.length,
   );
-  if (config.provider === 'anthropic') {
+  if (config.provider === 'anthropic' || config.provider === 'minimax') {
     return chatAnthropic(messages, tools, config);
   }
   return chatOpenAI(messages, tools, config);

apps/webuiapps/vite.config.ts

@@ -24,15 +24,16 @@ function llmProxyPlugin(): Plugin {
         req.on('end', async () => {
           try {
             const body = Buffer.concat(chunks).toString();
-            const headers: Record<string, string> = { 'Content-Type': 'application/json' };
-            // Forward auth-related headers and custom headers
-            const forwardKeys = ['authorization', 'x-api-key', 'anthropic-version'];
+            const headers: Record<string, string> = {};
+            // Forward all headers except host/connection/internal ones
+            const skipKeys = new Set(['host', 'connection', 'content-length', 'x-llm-target-url']);
             for (const [key, val] of Object.entries(req.headers)) {
               if (typeof val !== 'string') continue;
-              if (forwardKeys.includes(key)) {
-                headers[key] = val;
-              } else if (key.startsWith('x-custom-')) {
+              if (skipKeys.has(key)) continue;
+              if (key.startsWith('x-custom-')) {
                 headers[key.replace('x-custom-', '')] = val;
+              } else {
+                headers[key] = val;
               }
             }