[07souravkunda]

Summary

Two fixes, so the C# binding can be moved onto the gzip-encoded binary download (about 3.3× less CDN egress):

1. downloadBinary decodes Content-Encoding: gzip. It previously used WebClient.DownloadFile, which writes the response bytes as received, so a gzip-encoded binary would be saved compressed and fail to start. It now uses HttpClient with AutomaticDecompression = GZip | Deflate, the same client type fetchSourceUrl already uses, and streams the response to disk. The proxy handling is unchanged, and a partial file is deleted if the download fails.
2. The binding reports its real version in the User-Agent. GenerateAssemblyInfo has been false since the 2020 SDK-style csproj migration (d14811c), and the library has no AssemblyInfo.cs. As a result, <AssemblyVersion> never reached the DLL, and every release has sent User-Agent: browserstack-local-csharp/0.0.0000.0000. In the 7 days to 2026-10-26, that was 5,462 of the 5,464 C# calls to /binary/api/v1/endpoint; the other 2 sent no version. With the attribute generated, this release reports e.g. browserstack-local-csharp/3.1.0001.0000.

JIRA: https://browserstack.atlassian.net/browse/LOC-7549
Related:

• browserstack/local-service#706: hands latest_gzip to bindings that decode it. For C#, only when the reported version isn't 0.0.
• browserstack/local-binaries-for-deploy#73: publishes latest_gzip/.

Why the version fix is needed

latest_gzip/ objects are stored with Content-Encoding: gzip, and S3/CloudFront send gzip whatever Accept-Encoding the client sends. local-service must therefore give that path only to C# builds that contain fix 1. Every release in the field reports 0.0.0000.0000, so without fix 2 the new release would be indistinguishable from the old ones. With it:

User-Agent	local-service returns
browserstack-local-csharp/0.0.0000.0000 (all current releases)	latest_unzip (unchanged)
browserstack-local-csharp / …/Unknown	latest_unzip
browserstack-local-csharp/3.1.0001.0000 and later (this change)	latest_gzip, once the flag is on

Not in this PR

The version bump and release are left to the release branch, as usual.

Testing

• dotnet test "BrowserStackLocal Unit Tests" (.NET 6, macOS): 35 passed, 0 failed. The new tests are:
  • TestDownloadBinaryDecodesGzipContentEncoding: a local HttpListener serves a 2 MB binary with Content-Encoding: gzip, and the saved file must equal the original bytes;
  • TestDownloadBinarySavesUncompressedResponseAsIs: a plain response is saved unchanged;
  • TestDownloadBinaryFailureLeavesNoPartialFile: a 404 throws and leaves no file;
  • TestBindingVersionComesFromTheAssembly: the assembly version isn't 0.0.0.0 and flows into GetVersionStringFromAssemblyEmbedded.
• Both fixes are covered by a failing test:
  • restoring the original WebClient download makes the gzip test fail;
  • restoring GenerateAssemblyInfo=false makes the version test fail.
• End-to-end: the patched downloadBinary() was pointed at a gzip-encoded staging copy of the 8.9 darwin binary on CloudFront (binaries/LOC-7549_gzip_poc/, 10,156,640 B on the wire). It saved 36,317,952 B with the prod SHA-256 (9091089b…), and --version printed BrowserStack Local version 8.9.
• Not yet run here: the Windows msbuild build and integration tests in CI.

🤖 Generated with Claude Code

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