Authorization: Bearer [YOUR_ACCESS_TOKEN]

Content-Type: application/json

User-Agent: Your-App-Name/1.0

X-Custom-Header: custom-value

import google.auth
from google.auth.transport.requests import Request
from google.oauth2.credentials import Credentials

# 获取凭证
creds = Credentials.from_authorized_user_file('token.json', ['https://www.googleapis.com/auth/gmail.send'])

# 刷新令牌（如果需要）
if not creds.valid:
    if creds.expired and creds.refresh_token:
        creds.refresh(Request())

# 在请求中使用
headers = {
    'Authorization': f'Bearer {creds.token}',
    'Content-Type': 'application/json'
}

// 正确的头部设置示例
const headers = {
  'Authorization': `Bearer ${accessToken}`,
  'Content-Type': 'application/json'
};

fetch('https://gmail.googleapis.com/gmail/v1/users/me/messages/send', {
  method: 'POST',
  headers: headers,
  body: JSON.stringify({
    raw: base64EncodedEmail
  })
});

import time
import random
from googleapiclient.errors import HttpError

def send_email_with_retry(service, message):
    retry_count = 0
    max_retries = 5
    
    while retry_count < max_retries:
        try:
            return service.users().messages().send(userId='me', body=message).execute()
        except HttpError as error:
            if error.resp.status in [403, 429]:
                sleep_time = random.uniform(1, 2 ** retry_count)
                time.sleep(sleep_time)
                retry_count += 1
            else:
                raise
    raise Exception("Max retries exceeded")