[sf-lug] web clients (intermittently?) reject sendgrid URLs (was: Re: Firefox 77.0.1 rejects sendgrid URLs.)

[Michael Paoli]

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> From: "Bobbie Sellers" <bliss-sf4ever at dslextreme.com>
> Subject: Re: [sf-lug] Firefox 77.0.1 rejects sendgrid URLs.
> Date: Thu, 11 Jun 2020 13:57:07 -0700

> On 6/10/20 10:20 PM, Michael Paoli wrote:
>>> From: "Bobbie Sellers" <bliss-sf4ever at dslextreme.com>
>>> Subject: Re: [sf-lug] Firefox 77.0.1 rejects sendgrid URLs.
>>> Date: Wed, 10 Jun 2020 17:19:57 -0700
>>
>>>     Well this has been going on since the shift to Firefox 77.0.1
>>>
>>> This is just one example of the full URL which brings up that message.
>>>
>>> <https://u1584542.ct.sendgrid.net/ss/c/atcYNHk4Eh2YdGnwBh-YDNW_UEVavj84loUzOxRfMJv_zk85Z5k_bK_2c8w083WVPtJyswVJDPeA6bC07ZVNq9fUT_Q7eVj-nMX_7MPYCfIsdCvsTxCkLKOft3UuXvObt9g1ujsfAOw0m2umHrNiRzDpilzWYyYJPqEn3BMrQKVJjMkNtRqM2dSQGSyl4etQLpysfFHnXkguNvU91AQLNc22LGk2ZMWdbMi-nBqIlFv4O1zyK468iimXB2fN2o_AW0ijnlq5o19LriYU59VdpJs8iqEtnIfzOAcxVvSpo0-yB-HvGS0SftuABbt56LX4z1o2mK4-ww0SiPLk-F86vCPMjFSuSevJrXFemJxjVx6UNOWf2aYkx0QxGgJdYh8U/32i/qhteIEf1Q42lkA0z0liS1w/h0/e3-fC4qXuJ8Pak2nwzJpVv0vrRDv9uTMJwfhBu5Q8vM> All of the URLs are politically connected for petition  
>>> signatures
>>
>> Seems to work fine for me:
>> $ curl -I  
>> 'https://u1584542.ct.sendgrid.net/ss/c/atcYNHk4Eh2YdGnwBh-YDNW_UEVavj84loUzOxRfMJv_zk85Z5k_bK_2c8w083WVPtJyswVJDPeA6bC07ZVNq9fUT_Q7eVj-nMX_7MPYCfIsdCvsTxCkLKOft3UuXvObt9g1ujsfAOw0m2umHrNiRzDpilzWYyYJPqEn3BMrQKVJjMkNtRqM2dSQGSyl4etQLpysfFHnXkguNvU91AQLNc22LGk2ZMWdbMi-nBqIlFv4O1zyK468iimXB2fN2o_AW0ijnlq5o19LriYU59VdpJs8iqEtnIfzOAcxVvSpo0-yB-HvGS0SftuABbt56LX4z1o2mK4-ww0SiPLk-F86vCPMjFSuSevJrXFemJxjVx6UNOWf2aYkx0QxGgJdYh8U/32i/qhteIEf1Q42lkA0z0liS1w/h0/e3-fC4qXuJ8Pak2nwzJpVv0vrRDv9uTMJwfhBu5Q8vM'
>> HTTP/1.1 302 Found
>> Server: nginx
>> Date: Thu, 11 Jun 2020 05:15:20 GMT
>> Content-Type: text/html; charset=utf-8
>> Connection: keep-alive
>> Location:  
>> https://www.signherenow.org/petition/plastic-pollution/progress-america/?link_id=0&can_id=d03f7cbe2ab6c2c184ac59f4425b8e58&source=email-did-you-eat-a-credit-card-this-week-ill-explain&email_referrer=email_828804&email_subject=did-you-eat-a-credit-card-this-week-ill-explain
>> X-Robots-Tag: noindex, nofollow
>>
>> $ curl -I  
>> 'https://www.signherenow.org/petition/plastic-pollution/progress-america/?link_id=0&can_id=d03f7cbe2ab6c2c184ac59f4425b8e58&source=email-did-you-eat-a-credit-card-this-week-ill-explain&email_referrer=email_828804&email_subject=did-you-eat-a-credit-card-this-week-ill-explain'
>> HTTP/2 200
>> content-type: text/html; charset=utf-8
>> content-length: 12258
>> server: nginx
>> date: Thu, 11 Jun 2020 05:15:57 GMT
>> content-language: en
>> x-frame-options: SAMEORIGIN
>> x-content-type-options: nosniff
>> vary: Accept-Encoding,Cookie
>> x-cache: Miss from cloudfront
>> via: 1.1 45645ff3269a2b885ffa1653e827d0f7.cloudfront.net (CloudFront)
>> x-amz-cf-pop: SFO20-C1
>> x-amz-cf-id: 7ZCnl7c_YPVincYASVzE1I6TbwgBg2Mj1aNg57sDOGGHUzVoklcIKA==
>>
>> $
>> But I'm not using Firefox 77.0.1 - have you compared to other Firefox
>> versions at the same time?
>
>     No as none at hand.  Did try Otter Browser but it gave me the  
> same message.

Okay, well, that's at least one data point.  Subject adjusted
accordingly.  So, issue with multiple web clients,
but other folks/locations only able to intermittently (if at all?)
reproduce.

That's still not really enough to nail it down.  Reproducibility
would be a good thing ... even if decent statistical
reproducibility in the case of it being intermittent.
Precise error message(s) would help ... better yet,
precise HTTP(/https) response data - notably headers, but also if/as
relevant, body (especially if that's where error diagnostic is
coming from).