I am using an <iframe> HTML tag on my page e.g. to embed content from YouTube:
<iframe src="https://www.youtube.com/embed/DnPQNOq8x2s"></iframe>
However the content is not loaded.
In Firefox nothing is shown. In Chrome, a message like "Request blocked by an extension" is shown.
What is blocking the embedded iframe content and how can I get it to load and be shown?
This is probably due to the Content Security Policy HTTP response header.
If your HTTP framework or server is configured to insert this header into the response, you should make sure that you set the frame-src directive for it:
Content-Security-Policy: frame-src *.youtube.com; (or equivalent for any site you want to embed)
The documentation for your HTTP server or framework should specify how to configure this.
Related
I m trying to add amazon site in my website using iframe. But it fails by giving me the message as www.amazon.com refused to connect..
However other websites are working fine for the same iframe code.
iframe code:
<iframe src="https://www.amazon.com" width="800" height="600"></iframe>
Any help on explaining this mystery and possibly helping me add the amazon site as iframe is greatly appreciated.
I tried out your embed code in Chrome and saw the following error:
www.amazon.com refused to connect.
It means that the origin server does not authorize you to show this content inside an iframe.
The amazon product details page request returns the following response header:
X-Frame-Options: SAMEORIGIN
The X-Frame-Options HTTP response header can be used to indicate whether or not a browser should be allowed to render a page in a <frame>, <iframe>, <embed> or <object>. Sites can use this to avoid click-jacking attacks, by ensuring that their content is not embedded into other sites.
The added security is provided only if the user accessing the document is using a browser that supports X-Frame-Options.
Is there an attribute for iframes that will make it block requests to certain domains? Something like the following:
<iframe src="www.example.com" block-domains="google.com"></iframe>
So if block-domains is that magical attribute I'm looking for, it's telling the iframe to block all requests to google.com.
I believe the closest you can get to this is by setting X-Frame-options in the HEADER declaration. The documentation here states that you can provide any one of the 2 following options (the 3rd being obsolete):
DENY : the iframe will not be displayed, regardless of the page trying to embedd it
SAMEORIGIN : the iframe will only be displayed if called by a site having the same origin as the page itself (by checking the frame ancestors)
Another work around might be to use frame-ancestors as part of content security policy header, that will allow you to specify sites on which the iframe can be embedded.
As far as I know, it is not possible unless you have access to set response headers of the domain you want to load.
If you have access then you can set Content-Security-Policy response header to frame-src. It restricts what domains a page can load in an iframe.
For example: If the website at https://example.com has a response header of
Content-Security-Policy: frame-src 'self' *.trusted.com. Then it is only possible to make requests to example.com and *.trusted.com domains inside iframe.
I'm trying to load an IFrame on my website, but I'm getting the dreaded Refused to display 'url' in a frame because it set 'X-Frame-Options' to 'sameorigin'. However, when I look at the actual reponse headers sent from the other website I can't find a single occurance of X-Frame-Options!
Why does Chrome complain that the header is set when I can't find it in DevTools?
The URL of the site I'm trying to embedd is a https://localhost:44359 and it is running an ASP.NET Core MVC instance.
I tried adding some middleware to it to remove this header, but seeing as the header is never set there is also nothing to remove... unless, of course, this is set by MVC itself, in which case no middleware will help because MVC terminates the middleware pipeline.
I guess I could set a <meta> tag on the page itself, but even Google says that X-Frame-Options Allow-From is not supported and I found an article (unfortunaly can't find it again) that said Google would be using Content Security Policy for this instead. I tried adding frame-src https://localhost:44359 to the CSP for the site that is trying to embed an iframe, but that had no effect.
Is there any way of "forcing" Chrome (et al) to accept an iframe from localhost?
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?
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
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.
For any of you calling back to the same server for your IFRAME, pass this simple header inside the IFRAME page:
Content-Security-Policy: frame-ancestors 'self'
Or, add this to your web server's CSP configuration.
In my case it was that the site i was embedding had a specific url for embedding content and a different url for sharing
the url i had set in the iframe was
https://site/share/2432423232
changing it to
https://site/embed/2432423232
worked for me
The same issue appears to me, don't open the page in a private window.
You can use multiple browsers if you need to log in with different users.
Below is my code:
<div style="border: solid 1px #000000; margin: 5px;">
<iframe src="http://www.w3schools.com" width="100%" height="300px" scrolling="yes"><p>Your browser does not support iframe.</p></iframe>
</div>
Contents of iframe works well in chrome but not in firefox. I've disabled add-ons but my iframe is still empty. Can anyone please help me?
If you are trying to add this Iframe on a SSL-encrypted website (https://), it won't work any more since Firefox 23 because Mozilla has decided to blocked all unencrypted content on encrypted websites (for example http-iframes on https-websites).
You can change this behaviour in your own Firefox installation by typing about:config in the address bar and setting security.mixed_content.block_active_content to false.
But that won't help you for all other FF23-visitors on your website.
As of 05/2018, the iframe lead is denied by browser due to X-Frame-Options header set to 'sameorigin'.
Tested the page with Firefox and getting blank iframe.
Here is what console says:
Load denied by X-Frame-Options: https://www.w3schools.com/ does not permit cross-origin framing.
Why that?I'll give Chrome console a chance, here's what it says:
Refused to display 'https://www.w3schools.com/' in a frame because it set 'X-Frame-Options' to 'sameorigin'.
Basically, X-Frame-Options header (do not confuse that with CORS), is set to 'sameorigin', that means that the browser is allowed to display the iframe content only if embedded in same domain and same protocol (https://www.w3schools.com/ is not sameorigin of http://www.w3schools.com/).
Here are some docs aboiut x-frame-options:
https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Frame-Options
I don't know if its related but when I try to request w3schools by c# it responses 503 forbidden error. So they may use something to prevent showing up on iframes, etc. Facebook has similiar restrictions, you cannot display their likebox iframe unless you log in.
Why no one has mentioned CORS yet?
FROM mdn
Cross-Origin Resource Sharing (CORS) is a mechanism that uses
additional HTTP headers to let a user agent gain permission to access
selected resources from a server on a different origin (domain) than
the site currently in use. A user agent makes a cross-origin HTTP
request when it requests a resource from a different domain, protocol,
or port than the one from which the current document originated.
An example of a cross-origin request: A HTML page served from
http://domain-a.com makes an src request for
http://domain-b.com/image.jpg. Many pages on the web today load
resources like CSS stylesheets, images, and scripts from separate
domains, such as content delivery networks (CDNs).
For security reasons, browsers restrict cross-origin HTTP requests
initiated from within scripts. For example, XMLHttpRequest and the
Fetch API follow the same-origin policy. This means that a web
application using those APIs can only request HTTP resources from the
same domain the application was loaded from unless CORS headers are
used.
This means that the websites you are trying to enter from the iframe are set to deny requests from your site or others (if not all).
I had the same issue. For me the cause was a trailing slash at the end of the url.
Doesn't work:
<iframe src="http://example.com/some/sub/folder/"></iframe>
Works:
<iframe src="http://example.com/some/sub/folder"></iframe>
You need to have source file of iframe on localhost.
Firefox and Chrome doesn't display this iframe:
<iframe src="https://www.yourdomain.com/form.html"></iframe>
Works:
<iframe src="/form.html"></iframe>