Add ROOT_PATH env variable to simplify running Titiler behind a proxy (#343)

* Allow specifying a root path for reverse proxy setups

* Move root_path env loading to settings.py

* Remove os.getenv call

* Update changelog

Author: tayden

CHANGES.md

@@ -6,6 +6,9 @@
 
 * add `/crop` POST endpoint to return an image from a GeoJSON feature (https://github.com/developmentseed/titiler/pull/339)
 
+### titiler.application
+
+* add optional `root_path` setting to specify a url path prefix to use when running the app behind a reverse proxy (https://github.com/developmentseed/titiler/pull/343)
 
 ## 0.3.3 (2021-06-29)
 

src/titiler/application/titiler/application/main.py

@@ -33,6 +33,7 @@
     title=api_settings.name,
     description="A lightweight Cloud Optimized GeoTIFF tile server",
     version=titiler_version,
+    root_path=api_settings.root_path,
 )
 
 if not api_settings.disable_cog:

src/titiler/application/titiler/application/settings.py

@@ -9,6 +9,7 @@ class ApiSettings(pydantic.BaseSettings):
     name: str = "titiler"
     cors_origins: str = "*"
     cachecontrol: str = "public, max-age=3600"
+    root_path: str = ""
     debug: bool = False
 
     disable_cog: bool = False