means that the http request cannot be accessed in the https page, which is not secure, so the request is blocked. You turn off the https, the server uses the http protocol, and try to see if this is the problem.

upstairs is right. The page of https cannot request a page of http , because the security level of https is higher than that of http , so the request is blocked. It seems that api of Baidu Maps does not support https by default. If you want to support it, please refer to the statement on the Internet, change your request to start with https , and add & https to the end of the link. You can try this first.

check your browser access address.
if it is http, then all your requests use http.
if it is https, then all your requests use https.

if you do it according to the standard, there are fewer problems.