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EXCEED_MAX_RESPONSE_SIZE

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Error Cause​

Response size exceeds maximum response limit. CloudBase related API response limits are:

  • Mini program link maximum response body: 1 MB
  • Cloud function maximum response body: 6MB
  • Document database query maximum response body: 50 MB

Solution​

1. Use paginated queries​

For large amounts of data, use pagination to retrieve data in batches:

// Database query pagination example
const pageSize = 100;
const page = 1;

const result = await db
  .collection("users")
  .skip((page - 1) * pageSize)
  .limit(pageSize)
  .get();

2. Simplify return fields​

Only return necessary fields, avoid returning entire document:

// Only select needed fields
const result = await db
  .collection("users")
  .field({
    name: true,
    email: true,
    avatar: true,
    // Don't return large fields like description, content etc
  })
  .get();

3. Use cloud storage for large data transfer​

For very large data (such as export functionality), it's recommended to first write data to cloud storage, then return download link:

import cloudbase from "@cloudbase/node-sdk";

const app = cloudbase.init({
  env: "your-env-id", // Replace with your environment id
  region: "ap-shanghai", // Defaults to Shanghai region if not provided
});

exports.main = async (event, context) => {
  // Generate large amount of data
  const largeData = await generateLargeData();

  // Upload to cloud storage
  const fileName = `export_${Date.now()}.json`;
  await app.uploadFile({
    cloudPath: `exports/${fileName}`,
    fileContent: JSON.stringify(largeData),
  });

  // Get temporary download link
  const result = await cloud.getTempFileURL({
    fileList: [`exports/${fileName}`],
  });

  // Return download link
  return {
    downloadUrl: result.fileList[0].tempFileURL,
  };
};