MosaicJSON 424 error with http asset urls

[scottyhq]

I noticed some odd behavior with the default /mosaicjson endpoint with 424 (Failed Dependency) errors if the mosaic.json contains HTTP links.

You can reproduce the error by modifying the mosaic JSON in this example to use http urls (s3://noaa-eri-pds --> https://noaa-eri-pds.s3.amazonaws.com)
https://developmentseed.org/titiler/examples/notebooks/Working_with_MosaicJSON/

For example, this errors:
https://titiler.xyz/mosaicjson/map?url=https://gist.github.com/scottyhq/4c288a2dbf7b97ef7833c5e0ee19d6d6/raw/636083cf7117a96e38d271eeef932a3ee507d7d1/NOAA_Nashville_Tornado_v2_http.json

I see the same error running a local 0.15.6 titiler, but don't see any logs beyond 424 (Failed Dependency)
http://localhost:8000/mosaicjson/map?url=https://gist.github.com/scottyhq/4c288a2dbf7b97ef7833c5e0ee19d6d6/raw/636083cf7117a96e38d271eeef932a3ee507d7d1/NOAA_Nashville_Tornado_v2_http.json

Curiously if I use the mosaic.json from a local path it works!
http://localhost:8000/mosaicjson/map?url=file:///Users/scott/Downloads/NOAA_Nashville_Tornado_v2_http.json

#644 could be related in terms of some difference in how credentials are assumed in /mosaicjson versus /cog endpoints. The bucket is fully public and picking any single COG http url from the mosaic works with the /cog/map endpoint:
https://titiler.xyz/cog/map?url=https://noaa-eri-pds.s3.amazonaws.com/2020_Nashville_Tornado/20200307a_RGB/20200307aC0862230w361030n.tif

[vincentsarago]

@scottyhq

For example, this errors:
https://titiler.xyz/mosaicjson/map?url=https://gist.github.com/scottyhq/4c288a2dbf7b97ef7833c5e0ee19d6d6/raw/636083cf7117a96e38d271eeef932a3ee507d7d1/NOAA_Nashville_Tornado_v2_http.json

From what I can see, the tilejson endpoint is failing with

{
  "detail": "b''"
}

I think the issue comes from the gist url that gets redirected somehow!

I just tried with https://gist.githubusercontent.com/scottyhq/4c288a2dbf7b97ef7833c5e0ee19d6d6/raw/636083cf7117a96e38d271eeef932a3ee507d7d1/NOAA_Nashville_Tornado_v2_http.json

https://titiler.xyz/mosaicjson/map?url=https://gist.githubusercontent.com/scottyhq/4c288a2dbf7b97ef7833c5e0ee19d6d6/raw/636083cf7117a96e38d271eeef932a3ee507d7d1/NOAA_Nashville_Tornado_v2_http.json and it worked 🤷

[scottyhq]

huh, good catch! So the 'raw' button link in either github gist or repository results in the path with a direct that doesn't work. Instead use the final redirected link:

For example:
https://github.com/developmentseed/mosaicjson-spec/blob/main/0.0.2/example/dg_post_idai.json

DONT USE: https://github.com/developmentseed/mosaicjson-spec/raw/main/0.0.2/example/dg_post_idai.json

USE:
https://raw.githubusercontent.com/developmentseed/mosaicjson-spec/main/0.0.2/example/dg_post_idai.json

(https://titiler.xyz/mosaicjson/map?url=https://raw.githubusercontent.com/developmentseed/mosaicjson-spec/main/0.0.2/example/dg_post_idai.json)