git-ecosystem/git-credential-manager · error · Trace2Exception

Unable to detect host provider without a remote URL

Error message

Unable to detect host provider without a remote URL

What it means

During auto-detection, HostProviderRegistry.GetProviderAsync resolves the remote URI from the request; if there is no remote URL it cannot probe or match any host provider and throws this Trace2Exception. Auto-detection is inherently URL-driven, so a null remote URI is an unrecoverable input error.

Solutions

1. Ensure the git repository has a valid remote: git remote add origin <url>
2. When calling GCM programmatically, populate the request's remote URL (protocol + host) before requesting a provider
3. Register an explicit host provider instead of relying on auto-detection when no remote URL is available
4. Verify which credential operation is running; some flows (e.g. erase) may legitimately lack a URL and need different handling

Example fix

// before
var provider = await registry.GetProviderAsync(input); // input has no url
// after
if (input.GetRemoteUri() is null)
    input.Protocol = "https"; input.Host = "git.example.com"; // or fail earlier with a clear message
var provider = await registry.GetProviderAsync(input);

if (input.TryGetRemoteUri(out var uri) == false || uri is null)
    throw new InvalidOperationException("No remote URL available; set url or protocol+host before requesting a provider");

bool HasRemoteUrl(InputArguments input) => input.TryGetRemoteUri(out var uri) && uri != null;

try
{
    var provider = await registry.GetProviderAsync(input);
}
catch (Trace2Exception ex) when (ex.Message.Contains("without a remote URL"))
{
    logger.LogError("Credential request lacked a remote URL; check git remote configuration");
}

When it happens

Trigger: Calling GetProviderAsync with an InputArguments/request that lacks a remote URL — e.g. request.GetRemoteUri() returns null because no host, protocol, or path values were supplied (get operations without a remote configured).

Common situations: git credential fill invoked for a repository with no 'origin' remote, credential requests where url/protocol+host keys were stripped, or embedded usage of GCM without populating remote fields.

Understand the failure class

Background: "missing required argument" and "the following required arguments were not provided": what required-argument errors mean and how to fix them — this error's family across 20 libraries.

Related errors

• No host provider available to service this request.
• Cannot prompt because terminal prompts have been disabled.
• Missing 'protocol' request argument
• Invalid 'protocol' request argument (cannot be empty)
• Missing 'host' request argument

AI-assisted analysis of git-ecosystem/git-credential-manager@e8ce762cd0 (2026-09-11). Data as JSON: /api/errors/55e4ad17e2cf4ea6. Report an issue: GitHub.

Appendix: source

Thrown at src/Core/HostProviderRegistry.cs:155

                        _context.Console.WriteWarning($"a supported authority override was set but no such provider supporting authority '{authority}' was found. Falling back to auto-detection.");
                    }
                    else
                    {
                        return provider;
                    }
                }
            }

            //
            // Auto-detection
            // Perform auto-detection network probe and remember the result
            //
            _context.Trace.WriteLine("Performing auto-detection of host provider.");

            var uri = request.GetRemoteUri();
            if (uri is null)
            {
                throw new Trace2Exception(_context.Trace2, "Unable to detect host provider without a remote URL");
            }

            // We can only probe HTTP(S) URLs - for SMTP, IMAP, etc we cannot do network probing
            bool canProbeUri = StringComparer.OrdinalIgnoreCase.Equals(uri.Scheme, "http") ||
                               StringComparer.OrdinalIgnoreCase.Equals(uri.Scheme, "https");

            var probeTimeout = TimeSpan.FromMilliseconds(_context.Settings.AutoDetectProviderTimeout);
            _context.Trace.WriteLine($"Auto-detect probe timeout is {probeTimeout.TotalSeconds} ms.");

            HttpResponseMessage probeResponse = null;

            async Task<IHostProvider> MatchProviderAsync(HostProviderPriority priority, bool probe)
            {
                if (_hostProviders.TryGetValue(priority, out ICollection<IHostProvider> providers))
                {
                    _context.Trace.WriteLine($"Checking against {providers.Count} host providers registered with priority '{priority}'.");

                    // Try matching using the static Git request arguments first (cheap)

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