Magento2 Invalid return error when uploading VCL snippets to Fastly

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Chris Lohman

I'm trying to create a 301 redirect that is very similar to this one:

https://support.fastly.com/hc/en-us/community/posts/360040168631-How-Does-vcl-error-Work-

In my case, I simply want to redirect any request for www.shop.example.com to shop.example.com (The real domain I'm working with has been replaced by "example", for privacy fyi)

I have a VCL snippet for RECV:

if (req.http.host == "www.shop.example.com") {
  error 619 "Redirect www.shop";
}

Then I have a VCL snippet for ERROR:

if (obj.status == 619 && obj.response == "Redirect www.shop") {
set obj.status = 301;
set obj.response = "Moved Permanently";
set obj.http.Location = "https://shop.example.com" req.url;
synthetic {""};
return (deliver);
}

When I try to upload my VCL from Magento to Fastly:

Invalid return `error` ...in function `vcl_error` ...which is the `vcl_error` method Legal returns are: `deliver` `deliver_stale` `restart` at: (input Line 12079 Pos 5) error 619 "Redirect www.shop"; 

This is a pretty basic use case for Fastly, and after much Googling, I can't find anything helpful.  Does anyone here have any idea why this error is being thrown?

 

 

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  • Trin Dunbar

    Hi Chris! I don't see anything wrong with the VCL snippets, but from past tickets we've seen this error reported when the wrong subroutine is chosen -- ie. vcl_error instead of vcl_recv.

    Could you please check to see that the VCL snippets are in the correct subroutines?

    Also, I'm happy to take a deeper look into your configuration to see if there are any other factors contributing to the error you see. Let me know if that's something you require, and I can open a ticket from this post. Also feel free to open a ticket with support@fastly.com any time.

     

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  • Chris Lohman

    Hey Trin - thanks for the quick response.  Currently, here are some screen shots of the types.  They are correctly assigned to recv and error types.  I have many other snippets too.  I had the following thought, however this seems very unlikely to me, but is it possible that I'm not allowed to call error from multiple recv snippets?  I have one other recv snippet that is doing some geoip redirecting for continental Europe that has no issues whatsoever when saving.

     

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  • Trin Dunbar

    Thanks for checking! I think this requires a deeper look into your configuration, so I've created a ticket from this post. Please check your inbox for an email from support@fastly.com. Once resolved we can post the solution here for visibility.

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  • Trin Dunbar

    As a follow-up, we determined that the error was due to this snippet not being added to the vcl_recv subroutine:

    if (req.http.host == "www.shop.example.com") {
      error 619 "Redirect www.shop";
    }
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