Gracefully Broken Pdf Download May 2026

// Frontend / API validation example function validatePDFRequest(data) const issues = []; if (!data.content) issues.push("No content provided"); if (data.content?.length > 500_000) issues.push("Content too large (>500k chars)"); if (data.images?.some(img => img.size > 10_000_000)) issues.push("Image exceeds 10MB limit"); return issues;

Return a clean error message before ever calling the PDF engine. Never send an error inside a PDF binary. Use structured responses. Success (200 OK with PDF) Content-Type: application/pdf Content-Disposition: attachment; filename="report.pdf" Failure (200 OK with JSON) Even for errors, use 200 OK to avoid browser download interruption, then handle on frontend. gracefully broken pdf download

function exportRawData() const formData = collectFormData(); const blob = new Blob([JSON.stringify(formData, null, 2)], type: 'application/json' ); const url = URL.createObjectURL(blob); const a = document.createElement('a'); a.href = url; a.download = 'report-data.json'; a.click(); URL.revokeObjectURL(url); showToast("Raw data saved – you can retry PDF generation later."); const blob = new Blob([JSON.stringify(formData

"success": false, "error": "code": "PDF_GEN_FAILED", "message": "Could not render chart data: time series missing.", "recoverable": true, "suggestedAction": "retry", "userDataPreserved": true type: 'application/json' )

function logPDFFailure(error, context) navigator.sendBeacon('/api/log-pdf-error', JSON.stringify( errorCode: error.code, userAction: 'download_pdf', timestamp: Date.now(), page: window.location.pathname, dataSize: context.dataSize ));

async function downloadPDF() const response = await fetch('/api/generate-pdf', method: 'POST', body: formData ); const contentType = response.headers.get('content-type'); if (contentType.includes('application/json')) const error = await response.json(); showGracefulFailureDialog(error); return;