// 错误示例：未编码的参数
fetch('https://api.example.com/search?query=hello world')

// 正确示例：编码参数
fetch('https://api.example.com/search?query=' + encodeURIComponent('hello world'))

// 示例：设置正确的Content-Type
fetch('https://api.example.com/data', {
  headers: {
    'Content-Type': 'application/json',
    'Authorization': 'Bearer your_token_here'
  }
})

// 后端需要设置正确的CORS头
// Node.js示例
app.use((req, res, next) => {
  res.header('Access-Control-Allow-Origin', '*')
  res.header('Access-Control-Allow-Methods', 'GET, POST, PUT, DELETE')
  res.header('Access-Control-Allow-Headers', 'Content-Type, Authorization')
  next()
})

curl -v "https://api.example.com/data?id=123"

fetch('https://api.example.com/data')
  .then(response => {
    if (!response.ok) {
      throw new Error(`HTTP error! status: ${response.status}`)
    }
    return response.json()
  })
  .then(data => console.log(data))
  .catch(error => console.error('Fetch error:', error))