Support for !include with HTTP(S) seems broken

[azuker]

First, I'd like to thank you for this wonderful product, it helps us a great deal.

Using the latest version - 0.29.1, we have an issue rendering diagrams that have !include instruction with a HTTP or HTTPS address.
I tried several older versions, the problem still exists. When using much older versions it seems to work (I think it was 0.27.0) but we need a newer version with more features of PlantUML.

Scenario

Kroki

We use Docker and tried both with host network and without:

• docker run -p 8000:8000 --name kroki -e KROKI_SAFE_MODE=unsafe -d yuzutech/kroki:0.29.1
• docker run -p 8000:8000 --name kroki -e KROKI_SAFE_MODE=unsafe --net=host -d yuzutech/kroki:0.29.1

Note: I tried setting the following too but to no avail: PLANTUML_SECURITY_PROFILE=UNSECURE and ALLOW_PLANTUML_INCLUDE=true

Diagrams

I tried the following diagram, each time enabling back ONE of the !include - I am writing here in comment which ones worked:

@startuml

'!include http://localhost/dev/theme.puml - NOT working (it does work when I access that URL in my browser, no auth required of course)

'!include https://raw.githubusercontent.com/azuker/sw-design/refs/heads/gh-pages/puml/theme/usecases.puml - NOT working

'!include https://raw.githubusercontent.com/azuker/sw-design/refs/heads/gh-pages/puml/theme/usecases-icons.puml - NOT working

'!include <archimate/Archimate> - WORKS
'!include <aws/common> - WORKS
'!include <aws/Storage/AmazonS3/AmazonS3> - WORKS
'!include <aws/Storage/AmazonS3/bucket/bucket> - WORKS

start
  :IconTimer();
  if (Condition) then (Ok)
    :Step1 HL(Highligted);
  else (Error)
    :Step2;
  end if	
end

@enduml

Error

Exact diagram

@startuml
!include https://raw.githubusercontent.com/azuker/sw-design/refs/heads/gh-pages/puml/theme/usecases.puml
!include https://raw.githubusercontent.com/azuker/sw-design/refs/heads/gh-pages/puml/theme/usecases-icons.puml

start
  :IconTimer();
  if (Condition) then (Ok)
    :Step1 HL(Highligted);
  else (Error)
    :Step2;
  end if	
end

@enduml

Encoded diagram

Value: eNq9j0FqAzEMRdfxKdydZzEj2mWyCYRACoUu2gu4Y8UWmbGNJRPo6asOXfQE2UhI-v99dGTxTfq6mCfK89ID2iRSeQ_Q_H2KJKl_dcY2lyyYZZrLCv6737AB38eATDFDwytDQh8YYhqrj8hQFQqScEVQ_-wZeaoPChpJKX9xZvvQWLt_1eUnrdjccNCZrtadSg4kVPJglZCte78NelLxh2B9tpc3d6GYFoqCYXPhwmjdubXS_ilftlMOCt0Z7cYctf7G_wBmInnR

Kroki URL (works fine - no error): https://kroki.io/plantuml/svg/eNq9j0FqAzEMRdfxKdydZzEj2mWyCYRACoUu2gu4Y8UWmbGNJRPo6asOXfQE2UhI-v99dGTxTfq6mCfK89ID2iRSeQ_Q_H2KJKl_dcY2lyyYZZrLCv6737AB38eATDFDwytDQh8YYhqrj8hQFQqScEVQ_-wZeaoPChpJKX9xZvvQWLt_1eUnrdjccNCZrtadSg4kVPJglZCte78NelLxh2B9tpc3d6GYFoqCYXPhwmjdubXS_ilftlMOCt0Z7cYctf7G_wBmInnR

Docker Error

Accessing my container with the encoded diagram, I see an error of 400 Cannot open URL (line: 1).
When I inspect the docker logs, I see the following:

{
  "timestamp":"1767704977490",
  "level":"WARN",
  "thread":"vert.x-eventloop-thread-1",
  "mdc": {
    "error_message":"Cannot open URL (line: 1)",
    "path":"/plantuml/svg/eNq9j0FqAzEMRdfxKdydZzEj2mWyCYRACoUu2gu4Y8UWmbGNJRPo6asOXfQE2UhI-v99dGTxTfq6mCfK89ID2iRSeQ_Q_H2KJKl_dcY2lyyYZZrLCv6737AB38eATDFDwytDQh8YYhqrj8hQFQqScEVQ_-wZeaoPChpJKX9xZvvQWLt_1eUnrdjccNCZrtadSg4kVPJglZCte78NelLxh2B9tpc3d6GYFoqCYXPhwmjdubXS_ilftlMOCt0Z7cYctf7G_wBmInnR",
    "method":"GET",
    "action":"warning",
    "error_code":"400",
    "failure_class_name":"io.kroki.server.error.BadRequestException",
    "user_agent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/143.0.0.0 Safari/537.36"
  },
  "logger":"io.kroki.server.error.ErrorHandler",
  "message":"Bad request",
  "context":"default"
}

Is there something we can do to make it work?

[Invizory]

I'm also having this issue on 0.29.1. Everything works fine on 0.27.0, though.