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I had upgraded the magento version to 2.3.5 after that swagger is not working in my setup

Image Reference : enter image description here

To debug the i click invalid button it shows

{"schemaValidationMessages":[{"level":"error","message":"Can't read from file http://My Domain/rest/all/schema?services=all"}]}

The below errors i got in the debug.log

[2020-06-30 08:50:34] main.ERROR: Unable to resolve the source file for 'frontend/Vendor/child-theme/en_US/Magento_Swagger/swagger-ui/js/swagger-ui-bundle.js.map' [] []
[2020-06-30 08:50:34] main.CRITICAL: Unable to resolve the source file for 'frontend/Vendor/child-theme/en_US/Magento_Swagger/swagger-ui/js/swagger-ui-bundle.js.map' [] []
[2020-06-30 08:50:34] main.ERROR: Unable to resolve the source file for 'frontend/Vendor/child-theme/en_US/Magento_Swagger/swagger-ui/css/swagger-ui.css.map' [] []
[2020-06-30 08:50:34] main.CRITICAL: Unable to resolve the source file for 'frontend/Vendor/child-theme/en_US/Magento_Swagger/swagger-ui/css/swagger-ui.css.map' [] []
[2020-06-30 08:50:34] main.ERROR: Unable to resolve the source file for 'frontend/Vendor/child-theme/en_US/Magento_Swagger/swagger-ui/js/swagger-ui-standalone-preset.js.map' [] []
[2020-06-30 08:50:34] main.CRITICAL: Unable to resolve the source file for 'frontend/Vendor/child-theme/en_US/Magento_Swagger/swagger-ui/js/swagger-ui-standalone-preset.js.map' [] []

I ran the below commands and tested

  1. bin/magento deploy:mode:set developer - (Set the store to developer mode)
  2. Removed the pub/static frontend and adminhtml
  3. php bin/magento setup:upgrade
  4. php bin/magento setup:static-content:deploy -f
  5. php bin/magento setup:di:compile
  6. chmod -R 777 root_file/*
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    give try to disable all the dot mailer modules. there is \Datetime error breaking SOAP 2.3.5 so swagger tool also. Run command php bin/magento module:disable --clear-static-content Dotdigitalgroup_Email Dotdigitalgroup_Chat Dotdigitalgroup_Enterprise – sandip Jun 30 '20 at 10:35
  • @sandip Yes the solution worked well but by disabling this there is any cons or side-effect is there? – Sabareesh Jun 30 '20 at 10:44
  • its vendor bundled extension comes with by default, if your system not using this then you can remove it from a composer or disable it - see this - devdocs.magento.com/extensions/vendor – sandip Jun 30 '20 at 10:52
  • No, the solution did not work for me. – Abid Malik Jul 15 '20 at 3:35
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    Thanks @sandip It's working for me as well – RAKESH ROY Dec 12 '20 at 16:45
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There is a \Datetime error breaking SOAP 2.3.5 so it is affecting swagger tool. Run command below to resolve that issue.

php bin/magento module:disable --clear-static-content Dotdigitalgroup_Email Dotdigitalgroup_Chat Dotdigitalgroup_Enterprise

It may be possible other installed extensions may break swagger so have to debug on browser console level to check further.

NOTE: Only disable these modules if you do not need in your system or else if required then upgrade dotdigital modules because it may be the case that upgraded versions already have fix for that.

Reference Commit

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    its worked for me @Sabareesh you should accept this answer – matinict Dec 22 '20 at 3:49

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