alvarcarto/url-to-pdf-api

random errors when rendering pdf from html via POST

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#57 opened on Jan 25, 2018

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bughelp wanted

Description

First - thank you so much for creating and working on this project.

I've deployed to Heroku. Most of the time pdf is generated, sometimes there is an error and entire node server crashes.

Here is the log: url_to_pdf_api_error-01-25-2018.log

Is there a good way to debug this problem? Currently it crashes around ~20% of the time. I was running on "hobby" initially, but had same results on 1x and 2x instance types.

Contributor guide

Tech stack
javascriptnodejs
Domain
backendapi
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
needs investigation
Prerequisites
Basic Node.js debuggingUnderstanding of HTTP servers
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
20
Research direction
The issue reports intermittent crashes when rendering PDF from HTML via POST. The user has provided a log file link. To debug, start by examining the log file content to identify crash patterns. Check the rendering code in the repository, likely using Headless Chrome or similar. Look for unhandled promise rejections or memory leaks. Consider adding more robust error handling and ensure all promises are handled. Test with sample HTML payloads to isolate the issue. Also, review recent commits or similar issues for potential fixes.