PlantUML Online Server returns inconsistent SVG contents

[filzrev]

Describe the bug

When generating SVG image with PlantUML Online Server(https://www.plantuml.com/plantuml/svg). Returned SVG content is inconsistent.

To Reproduce

1. Download SVG file content with following URL.

   https://www.plantuml.com/plantuml/svg/SoWkIImgAStDuNBAJrBGjLDmpCbCJbMmKiX8pSd9vt98pKi1IW80

2. Check returned SVG text.
3. two-patterns exists in returned SVG content text.

Pattern1: Returns width="113px"

?xml version="1.0" encoding="us-ascii" standalone="no"?><svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" contentStyleType="text/css" height="120px" preserveAspectRatio="none" style="width:113px;height:120px;background:#FFFFFF;" version="1.1" viewBox="0 0 113 120" width="113px" zoomAndPan="magnify"><defs/><g><line style="stroke:#181818;stroke-width:0.5;stroke-dasharray:5.0,5.0;" x1="26" x2="26" y1="36.2969" y2="85.4297"/><line style="stroke:#181818;stroke-width:0.5;stroke-dasharray:5.0,5.0;" x1="82" x2="82" y1="36.2969" y2="85.4297"/><rect fill="#E2E2F0" height="30.2969" rx="2.5" ry="2.5" style="stroke:#181818;stroke-width:0.5;" width="43" x="5" y="5"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacing" textLength="29" x="12" y="24.9951">Bob</text><rect fill="#E2E2F0" height="30.2969" rx="2.5" ry="2.5" style="stroke:#181818;stroke-width:0.5;" width="43" x="5" y="84.4297"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacing" textLength="29" x="12" y="104.4248">Bob</text><rect fill="#E2E2F0" height="30.2969" rx="2.5" ry="2.5" style="stroke:#181818;stroke-width:0.5;" width="49" x="58" y="5"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacing" textLength="35" x="65" y="24.9951">Alice</text><rect fill="#E2E2F0" height="30.2969" rx="2.5" ry="2.5" style="stroke:#181818;stroke-width:0.5;" width="49" x="58" y="84.4297"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacing" textLength="35" x="65" y="104.4248">Alice</text><polygon fill="#181818" points="70.5,63.4297,80.5,67.4297,70.5,71.4297,74.5,67.4297" style="stroke:#181818;stroke-width:1.0;"/><line style="stroke:#181818;stroke-width:1.0;" x1="26.5" x2="76.5" y1="67.4297" y2="67.4297"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="30" x="33.5" y="62.3638">hello</text><!--SRC=[SyfFKj2rKt3CoKnELR1Io4ZDoSa70000]--></g></svg>

Pattern2: Returns width="109px"

<?xml version="1.0" encoding="us-ascii" standalone="no"?><svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" contentStyleType="text/css" height="120px" preserveAspectRatio="none" style="width:109px;height:120px;background:#FFFFFF;" version="1.1" viewBox="0 0 109 120" width="109px" zoomAndPan="magnify"><defs/><g><line style="stroke:#181818;stroke-width:0.5;stroke-dasharray:5.0,5.0;" x1="26" x2="26" y1="36.2969" y2="85.4297"/><line style="stroke:#181818;stroke-width:0.5;stroke-dasharray:5.0,5.0;" x1="80" x2="80" y1="36.2969" y2="85.4297"/><rect fill="#E2E2F0" height="30.2969" rx="2.5" ry="2.5" style="stroke:#181818;stroke-width:0.5;" width="42" x="5" y="5"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacing" textLength="28" x="12" y="24.9951">Bob</text><rect fill="#E2E2F0" height="30.2969" rx="2.5" ry="2.5" style="stroke:#181818;stroke-width:0.5;" width="42" x="5" y="84.4297"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacing" textLength="28" x="12" y="104.4248">Bob</text><rect fill="#E2E2F0" height="30.2969" rx="2.5" ry="2.5" style="stroke:#181818;stroke-width:0.5;" width="46" x="57" y="5"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacing" textLength="32" x="64" y="24.9951">Alice</text><rect fill="#E2E2F0" height="30.2969" rx="2.5" ry="2.5" style="stroke:#181818;stroke-width:0.5;" width="46" x="57" y="84.4297"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacing" textLength="32" x="64" y="104.4248">Alice</text><polygon fill="#181818" points="68,63.4297,78,67.4297,68,71.4297,72,67.4297" style="stroke:#181818;stroke-width:1.0;"/><line style="stroke:#181818;stroke-width:1.0;" x1="26" x2="74" y1="67.4297" y2="67.4297"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="30" x="33" y="62.3638">hello</text><!--SRC=[SyfFKj2rKt3CoKnELR1Io4ZDoSa70000]--></g></svg>

Expected behavior Plant UML online server returns consistent results if input is same.

Additional context HTTP header returns X-Powered-By: PlantUML Version 1.2024.4 in both cases. I've confirmed following response headers.

1. ETag
   • Returns: width:113px;: "4fe7b3c0ab50190ac65d4b796a6fc24dukyV6cC-2U2JqdaYHCSN7000-gzip-gzip"
   • Returns: width:109px; "4fe7b3c0ab50190ac65d4b796a6fc24dukyV6cC-2U2JqdaYHCSN7000-gzip"
2. X-Quote
   • Values are changed per requests.

When running PlantUML server on docker. It always returns width:109px; content. So it's expected to be PlantUML Onnline Server problems

[arnaudroques]

We are currently upgrading our infrastructure for the PlantUML Online Server.

Actually, we don't rely on a single server; we utilize a network of servers. Currently, we have both 'new' and 'old' servers operational simultaneously. This strategy allows us to smoothly transition our infrastructure while ensuring everything functions correctly. This transition was intended to be imperceptible to users, but since you've observed it, it appears it hasn't been entirely transparent :-)

Is this a big issue for you?

[filzrev]

Thanks for your response.

It's observed because our CI tests calling PlantUML Online Server API. And snapshot image diffs are randomly failed.

In any way. It should use self-hosted version of PlantUML for integration tests. I'm closing this issue.