Structure
Kroki API returned HTTP 400
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<tspan x="10" dy="16">Error 400: SyntaxError: Parse error on line 42:</tspan>
<tspan x="10" dy="16">...4,stroke-width:2px</tspan>
<tspan x="10" dy="16">---------------------^</tspan>
<tspan x="10" dy="16">Expecting 'SEMI', 'NEWLINE', 'SPACE', 'EOF', 'subgraph', 'end', 'acc_title', 'acc_descr', 'acc_descr_multiline_value', 'AMP', 'COLON', 'STYLE', 'LINKSTYLE', 'CL…</tspan>
<tspan x="10" dy="16">Error: Syntax error in graph</tspan>
<tspan x="10" dy="16"> at Worker.convert (file:///usr/local/kroki/src/worker.js:103:15)</tspan>
<tspan x="10" dy="16"> at async file:///usr/local/kroki/src/index.js:36:28</tspan>
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TODO