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I have many orgs with my app in it, and my app has a Canvas component, and intermittently for the last couple days this one org has been showing the following error:

The value of the "binding" parameter contains a character that is not allowed or the value exceeds the maximum allowed length. Remove the character from the parameter value or reduce the value length and resubmit. If the error still persists, report it to our Customer Support team. Provide the URL of the page you were requesting as well as any other related information.

Then it fixes itself. This shows up both on pages that pass dynamic parameter data to the Canvas app as well as on a page that only passes a hardcoded parameter of page_type, which works in all the other apps.

Anybody know anything about what's going on here?

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  • Oh, I should note that I don't have anything set up anywhere with the word 'binding' - no parameters, no custom objects, no custom fields. I haven't found anything named binding.
    – freyley
    Nov 13, 2015 at 20:34

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We found this known issue in Winter 16: Canvas App Doesn't Load in Internet Explorer Due to Parameter Length

The circumstance of the error is similar; there's content in the parameters to canvasApp that seems like it could cause a too-long URL, but the error message quoted in the question is coming from foo.my.salesforce.com/idp/endpoint/HttpPost/services/oauth2/authorize, not a URL that seems to be cut off by an IE limitation. (Especially as we're seeing this in non-IE browsers.)

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