We need a comprehensive set of security integration specs to make sure AuthProxy is secure.
Typically leverage Aspire testing, set up different IDPs and hammer it.
We should have good OWASP coverage.
Approach
There is no dedicated C# OWASP test harness specifically for YARP or reverse proxies. Here is what exists and what we should combine:
OWASP ZAP .NET API
There is an OWASPZAPDotNetAPI NuGet package that lets you drive ZAP scans from C# xUnit. It is not a test harness per se — more of an API wrapper to automate ZAP scans and assert on results. It can be integrated into a CI pipeline.
Practical approach for YARP specifically
Since AuthProxy is a reverse proxy, we need to validate things like header forwarding, request smuggling, and access control bypass — YARP-specific concerns ZAP won’t cover. We should combine:
-
OWASP ZAP (via Docker + API) — for DAST scanning through the proxy. ZAP can be driven from C# by spawning it as a Docker process and calling its HTTP API.
-
Custom C# integration tests — using WebApplicationFactory + HttpClient to send crafted requests (header injection, hop-by-hop header abuse, path traversal, etc.) and assert on proxied behavior.
-
Microsoft.Playwright or HttpClient fuzzing — send malformed JSON, unexpected types, and extra properties to fuzz endpoints programmatically.
Bottom line
We will need to build the YARP-specific harness ourselves on top of xUnit + WebApplicationFactory, and bolt ZAP onto it for OWASP Top 10 coverage. There is no off-the-shelf “OWASP test suite for YARP.”
We need a comprehensive set of security integration specs to make sure AuthProxy is secure.
Typically leverage Aspire testing, set up different IDPs and hammer it.
We should have good OWASP coverage.
Approach
There is no dedicated C# OWASP test harness specifically for YARP or reverse proxies. Here is what exists and what we should combine:
OWASP ZAP .NET API
There is an OWASPZAPDotNetAPI NuGet package that lets you drive ZAP scans from C# xUnit. It is not a test harness per se — more of an API wrapper to automate ZAP scans and assert on results. It can be integrated into a CI pipeline.
Practical approach for YARP specifically
Since AuthProxy is a reverse proxy, we need to validate things like header forwarding, request smuggling, and access control bypass — YARP-specific concerns ZAP won’t cover. We should combine:
OWASP ZAP (via Docker + API) — for DAST scanning through the proxy. ZAP can be driven from C# by spawning it as a Docker process and calling its HTTP API.
Custom C# integration tests — using WebApplicationFactory + HttpClient to send crafted requests (header injection, hop-by-hop header abuse, path traversal, etc.) and assert on proxied behavior.
Microsoft.Playwright or HttpClient fuzzing — send malformed JSON, unexpected types, and extra properties to fuzz endpoints programmatically.
Bottom line
We will need to build the YARP-specific harness ourselves on top of xUnit + WebApplicationFactory, and bolt ZAP onto it for OWASP Top 10 coverage. There is no off-the-shelf “OWASP test suite for YARP.”