iframe refuses to display

问题:

I am trying to load a simple iframe into one of my web pages but it is not displaying. I am getting this error in Chrome:

Refused to display 'https://cw.na1.hgncloud.com/crossmatch/index.do' in a frame because an ancestor violates the following Content Security Policy directive: "frame-ancestors 'self' https://cw.na1.hgncloud.com".


Invalid 'X-Frame-Options' header encountered when loading 'https://cw.na1.hgncloud.com/crossmatch/index.do': 'ALLOW-FROM https://cw.na1.hgncloud.com' is not a recognized directive. The header will be ignored.

This is the code for my iframe:

<p><iframe src="https://cw.na1.hgncloud.com/crossmatch/" width="680" height="500" frameborder="0"></iframe></p>

I am not really sure what that means. I have loaded plenty iframes before and never received such errors.

Any ideas?

Thanks

回答1:

It means that the http server at cw.na1.hgncloud.com send some http headers to tell web browsers like Chrome to allow iframe loading of that page (https://cw.na1.hgncloud.com/crossmatch/) only from a page hosted on the same domain (cw.na1.hgncloud.com) :

Content-Security-Policy: frame-ancestors 'self' https://cw.na1.hgncloud.com
X-Frame-Options: ALLOW-FROM https://cw.na1.hgncloud.com

You should read that :

• https://developer.mozilla.org/en-US/docs/Web/Security/CSP
• https://developer.mozilla.org/en-US/docs/Web/Security/Same-origin_policy

回答2:

The reason for the error is that the host server for https://cw.na1.hgncloud.com has provided some HTTP headers to protect the document. One of which is that the frame ancestors must be from the same domain as the original content. It seems you are attempting to put the iframe at a domain location that is not the same as the content of the iframe - thus violating the Content Security Policy that the host has set.

Check out this link on Content Security Policy for more details.

回答3:

if you want to use iframe tag you should write code like these

<iframe src="https://www.youtube.com/embed/vTSdZ354cNQ" width="800" height="800" ></iframe>

1. first you have to write domain name https://www.youtube.com/
2. write/embed
3. write the name or serial number of video such like youtube you want to prievew vTSdZ354cNQ