make error more descriptive

packages/sdk/js/src/v2/client.ts

@@ -79,7 +79,8 @@ export function createOpencodeClient(config?: Config & { directory?: string; exp
   )
   client.interceptors.response.use((response) => {
     const contentType = response.headers.get("content-type")
-    if (contentType === "text/html") throw new Error("Unexpected content-type: " + contentType)
+    if (contentType === "text/html")
+      throw new Error("Request is not supported by this version of OpenCode Server (Server responded with text/html)")
 
     return response
   })