flask返回图片流

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# -*- coding: utf-8 -*- import os from io import BytesIO from PIL import Image from flask import Flask, make_response,send_file   app = Flask(__name__) app.config['SECRET_KEY'] = 'test' BASE_PATH = os.path.dirname(os.path.abspath(__file__))   def get_image_stream(name):     with open(f'{name}.jpg', 'rb') as image_file:         image_stream = image_file.read()     return image_stream   @app.route('/image/<image_id>') def image(image_id):     if image_id=="1":         # 将图片发送到浏览器         return send_file('1.jpg', mimetype='image/jpeg')     elif image_id=="2":         return get_image_stream(2)       else :         img = Image.new('RGB', (200, 200), color = (73, 109, 137))         out = BytesIO()         img.save(out, 'jpeg')         out.seek(0)         resp = make_response(out)         resp.content_type = 'image/jpeg'         return resp     @app.route('/<image_id>') def index(image_id):       return f"<img src='/image/{image_id}'>"   if __name__ == '__main__':     app.run( host='0.0.0.0', port=9181, debug=True)