Tile is not rendered when request for glyph fails with a 404
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Description
**mapbox-gl-js version**: v1.9.1
**browser**: Firefox/Chrome, likely any
This has been reported before in #662, but was fixed according to https://github.com/mapbox/mapbox-gl-js/issues/662#issuecomment-51666835.
### Steps to Trigger Behavior
Use a non-existing font as value for the `text-font` layout property.
### Link to Demonstration
#### Non-existing font resulting in 404 and affected tiles are not rendered
https://jsbin.com/mahoxoduhu/1/edit?html,output
#### Existing font
https://jsbin.com/vexanaqiju/1/edit?html,output
### Expected Behavior
All tiles are rendered (the tiles with missing glyphs without labels).
### Actual Behavior
Map is only partially rendered - tiles with labels are not rendered because of failing requests for glyphs (404).
There is no error or warning in the browser console (there is only the 404 in the network tab).
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with the glyph-request and tile-rendering paths implicated by the report, using the JSBin reproduction with a non-existing text-font value. Compare it with the existing-font reproduction and verify that a 404 leaves affected tiles rendered without their labels, with no browser-console error.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- typescript
- Domain
- frontend
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 42/100