fix: change content-type to json (#117)

Related PR: https://github.com/landing-ai/vision-agent-service/pull/22

Changes the POST request from `multipart/form-data` to the
`application/json`

Also removed the useless `mediaUrl` param.

app/api/vision-agent/route.ts

@@ -110,16 +110,12 @@ export const POST = withLogging(
       apiMessages: string;
       chatId: string;
       messageId: string;
-      mediaUrl: string;
     },
     request,
   ) => {
-    const { apiMessages, mediaUrl, chatId, messageId } = json;
+    const { apiMessages, chatId, messageId } = json;
     const user = session?.user?.email ?? 'anonymous';
 
-    const formData = new FormData();
-    formData.append('input', apiMessages);
-
     const fetchResponse = await fetch(
       `${process.env.AGENT_HOST}/v1/agent/chat?agent_class=vision_agent&self_reflection=false`,
       {
@@ -130,8 +126,9 @@ export const POST = withLogging(
             process.env.LND_TIER === 'production'
               ? 'land_sk_nMnUf8xiJJUjyw1l5QaIJJ4ZyrvPthzVmPAIG7TtJY7F9CW6lu' // prod key
               : 'land_sk_DKeoYtaZZrYqJ9TMMiXe4BIQgJcZ0s3XAoB0JT3jv73FFqnr6k', // dev key
+          "content-type": "application/json"
         },
-        body: formData,
+        body: JSON.stringify({ input: apiMessages }),
       },
     );
 
@@ -363,15 +360,15 @@ export const POST = withLogging(
         controller.enqueue(
           encoder.encode(
             '2:' +
-              JSON.stringify([
-                {
-                  type: 'init',
-                  payload: {
-                    messageId,
-                  },
+            JSON.stringify([
+              {
+                type: 'init',
+                payload: {
+                  messageId,
                 },
-              ]) +
-              '\n',
+              },
+            ]) +
+            '\n',
           ),
         );
         for await (const chunk of fetchResponse.body as any) {