Server address sensitive to trailing slash

[mhenry-cb]

Starting with pyroscope/pyroscope-dotnet:0.14.0-glibc, the PYROSCOPE_SERVER_ADDRESS environment variable is sensitive to a trailing slash.

When there's a trailing slash (e.g. PYROSCOPE_SERVER_ADDRESS=http://pyroscope:4040/), the application and profiles are missing from the Pyroscope UI (logs indicate HTTP 301 status but no other error messages). Without the trailing slash (e.g. PYROSCOPE_SERVER_ADDRESS=http://pyroscope:4040), the application and profiles show up as expected in the Pyroscope UI.

0.13.0-glibc and 0.14.0-rc.7-glibc work as expected when server address has a trailing slash.

0.14.0-glibc and 0.14.2-glibc do not work as expected when server address has a trailing slash.

Example debug logs when the issue occurs:

• .NET application with environment variable DD_TRACE_DEBUG=true:
  • [2026-03-18 12:00:00.000 | debug | PId: 1 | TId: 10] PyroscopePprofSink 301
• grafana/pyroscope with command -log.level=debug:
  • ts=2026-03-18T12:00:00.000000000Z caller=http.go:346 level=debug traceID=1c880ae6196c8320 method=POST uri=//push.v1.PusherService/Push status=301 duration=49.622µs msg="http request processed"

Note the 301 status and the double slash at the beginning of the //push.v1.PusherService/Push uri.

[mhenry-cb]

It looks like the previous implementation of PyroscopePprofSink.cpp normalized the path:

std::string path = Url()
                           .path(_url.path() + "/ingest")
                           .add_query("name", _appNameWithLabels)
                           .add_query("from", std::to_string(startTime.time_since_epoch().count()))
                           .add_query("until", std::to_string(endTime.time_since_epoch().count()))
                           .add_query("spyName", "dotnetspy")
                           .add_query("spyVersion", PYROSCOPE_SPY_VERSION)
                           .str();

By comparison, the current implementation does not normalize the path:

std::string path = _url.path() + "/push.v1.PusherService/Push";