fix: error connecting to ollama (#6349)

web-app/src/lib/completion.ts

@@ -71,18 +71,18 @@
 
   // Add attachments to content array
   if (attachments) {
     attachments.forEach((attachment) => {
       if (attachment.type.startsWith('image/')) {
         contentParts.push({
           type: ContentType.Image,
           image_url: {
             url: `data:${attachment.type};base64,${attachment.base64}`,
             detail: 'auto',
           },
         } as any)
       }
     })
   }
 
   return {
     type: 'text',
@@ -153,47 +153,54 @@
  * @returns
  */
 export const sendCompletion = async (
   thread: Thread,
   provider: ModelProvider,
   messages: ChatCompletionMessageParam[],
   abortController: AbortController,
   tools: MCPTool[] = [],
   stream: boolean = true,
   params: Record<string, object> = {}
 ): Promise<ChatCompletionResponse | undefined> => {
   if (!thread?.model?.id || !provider) return undefined
 
   let providerName = provider.provider as unknown as keyof typeof models
 
   if (!Object.keys(models).some((key) => key === providerName))
     providerName = 'openai-compatible'
 
   const tokenJS = new TokenJS({
     apiKey: provider.api_key ?? (await getServiceHub().core().getAppToken()) ?? '',
     // TODO: Retrieve from extension settings
     baseURL: provider.base_url,
     // Use Tauri's fetch to avoid CORS issues only for openai-compatible provider
     ...(providerName === 'openai-compatible' && { fetch: getServiceHub().providers().fetch() }),
     // OpenRouter identification headers for Jan
     // ref: https://openrouter.ai/docs/api-reference/overview#headers
     ...(provider.provider === 'openrouter' && {
       defaultHeaders: {
         'HTTP-Referer': 'https://jan.ai',
         'X-Title': 'Jan',
       },
     }),
+    // Add Origin header for local providers to avoid CORS issues
+    ...((provider.base_url?.includes('localhost:') || provider.base_url?.includes('127.0.0.1:')) && {
+      fetch: getServiceHub().providers().fetch(),
+      defaultHeaders: {
+        'Origin': 'tauri://localhost',
+      },
+    }),
   } as ExtendedConfigOptions)
 
   if (
     thread.model.id &&
     !Object.values(models[providerName]).flat().includes(thread.model.id) &&
     !tokenJS.extendedModelExist(providerName as any, thread.model.id) &&
     provider.provider !== 'llamacpp'
   ) {
     try {
       tokenJS.extendModelList(
         providerName as any,
         thread.model.id,
         // This is to inherit the model capabilities from another built-in model
         // Can be anything that support all model capabilities
         models.anthropic.models[0]

web-app/src/services/providers/tauri.ts

@@ -143,6 +143,12 @@ export class TauriProvidersService extends DefaultProvidersService {
         'Content-Type': 'application/json',
       }
 
+      // Add Origin header for local providers to avoid CORS issues
+      // Some local providers (like Ollama) require an Origin header
+      if (provider.base_url.includes('localhost:') || provider.base_url.includes('127.0.0.1:')) {
+        headers['Origin'] = 'tauri://localhost'
+      }
+
       // Only add authentication headers if API key is provided
       if (provider.api_key) {
         headers['x-api-key'] = provider.api_key