ArcGIS Vector Tile Service does not attach authorizaion headers

[BlakeOrth]

What is the bug or the crash?

When using APIHeader Authentication with an ArcGIS Vector Tile Service, the user specified headers are not added to the HTTP requests.

Steps to reproduce the issue

1. Add a new ArcGIS Vector Tile service connection
2. Fill in the form using some example http URL

3. Add or create an APIHeader authentication configuration for the connection, using an Authorization header key and a valid example credential value (e.g. Basic fake-creds)

4. Launch the Debugging/Development tools, select the Network Logger and enable recording
5. Add the new layer to the project
6. Note the recorded GET request to the configured endpoint does not contain the expected Authorization header

Versions

QGIS version	3.44.3-Solothurn
QGIS code branch	Release 3.44
Libraries
Qt version	5.15.17
Python version	3.13.7
GDAL version	3.11.3 — Eganville
PROJ version	9.6.0
EPSG Registry database version	v12.004 (2025-03-02)
GEOS version	3.13.1-CAPI-1.19.2
SQLite version	3.50.4
PDAL version	2.9.2
PostgreSQL client version	17.5
SpatiaLite version	5.1.0
QWT version	6.3.0
QScintilla2 version	2.14.1
OS version	Arch Linux
Active Python plugins
MetaSearch	0.3.6
db_manager	0.1.20
grassprovider	2.12.99
processing	2.12.99

Supported QGIS version

• I'm running a supported QGIS version according to the roadmap.

New profile

• I tried with a new QGIS profile

Additional context

No response