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Another way to solve the problem is: through src="/img/{{xx.image field.grid_id}}/" Defined as a public View Get the actual image stored through GridFS through the passed string objectid and output

from flask import Response
from bson.objectid import ObjectId
from mongoengine import *
app.route('/img/<oid>/')
def get_img(oid=None):
    if oid:
        proxy = GridFSProxy(grid_id=ObjectId(oid))
        return Response(proxy.read(),mimetype='image/jpeg')

nginx+mongodbgridfs plug-in. No?

 <img src="data:image/jpeg;base64,{{xx.圖片字段base64編碼}}" />

Similarly applies to other encodings and formats, but note that older browsers do not support this method.