Failed to print WMS

[JePedrosa]

Use case: description, code

Hi, I am using a plugin in leflet that uses dom_to_image to generate an image to later download it or put it in a PDF file and it generates them perfectly until it passes a div that contains a WMS image that then gets stuck and does not return any image, as an error it gives me that isTrusted = true. Then I send an example so that it can be better appreciated. Thank you

https://jsfiddle.net/JesusPedrosa/qu5d43wL/

Browsers

• [x] Chrome 49+
• [x] Firefox 45+

[Syndesi]

Hi,

thank you for the detailed demo, now we can actually help you :) And in fact, I allready found the reason: CORS. Basically you want to display stuff from a different domain http://www.idemap.es/... and want to display it on a secure website (HTTPS). The browser will let you do that, but will mark the data as "mixed content", therefore operations which might be insecure are canceled. If you change the URL to https://www.idemap.es/... (HTTPS instead of HTTP, line 31 in your JSFiddle), you can actually resolve your primary error. And that leads us to CORS: Content served from idemap.es don't have the Access-Control-Allow-Origin HTTP-attribute, therefore further execution is stoped too :/ At this point I only knew three solutions:

• you can ask the people at idemap.es kindly if the add these parameters
• you can switch your data source (if possible)
• you can add a proxy (you send the request to your server which gets the original data and wraps it into the CORS headers for you)

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resolves #189

[JePedrosa]

Thank you very much for your response, after doing several tests and researching CORS, I think the error is in how I said it does not have the Access-Control-Allow-Origin attribute and therefore it will not let me, I will try to contact them In case you can give me a solution.

Thank you

[Syndesi]

Hi,

I think that Access-Control-Allow-Origin: * should be enough, but I'm not an expert with CORS. I just ran into similar problems and solved them with my own PHP-library. Btw, I created a new Fiddle which uses Mapbox's tilelayers and it actually works: Fiddle But make sure to use your own Mapbox account in production, because it's currently using my credentials which might change sometime.