{"record":{"id":"ec3e5ed9dded38f2","repo":"ent/ent","slug":"gremlin-http-parsing-url-w","errorCode":null,"errorMessage":"gremlin/http: parsing url: %w","messagePattern":"gremlin/http: parsing url: %w","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"dialect/gremlin/http.go","lineNumber":29,"sourceCode":"\t\"io\"\n\t\"net/http\"\n\t\"net/url\"\n\n\t\"entgo.io/ent/dialect/gremlin/encoding/graphson\"\n\n\tjsoniter \"github.com/json-iterator/go\"\n)\n\ntype httpTransport struct {\n\tclient *http.Client\n\turl    string\n}\n\n// NewHTTPTransport returns a new http transport.\nfunc NewHTTPTransport(urlStr string, client *http.Client) (RoundTripper, error) {\n\tu, err := url.Parse(urlStr)\n\tif err != nil {\n\t\treturn nil, fmt.Errorf(\"gremlin/http: parsing url: %w\", err)\n\t}\n\tif client == nil {\n\t\tclient = http.DefaultClient\n\t}\n\treturn &httpTransport{client, u.String()}, nil\n}\n\n// RoundTrip implements RouterTripper interface.\nfunc (t *httpTransport) RoundTrip(ctx context.Context, req *Request) (*Response, error) {\n\tif req.Operation != OpsEval {\n\t\treturn nil, fmt.Errorf(\"gremlin/http: unsupported operation: %q\", req.Operation)\n\t}\n\tif _, ok := req.Arguments[ArgsGremlin]; !ok {\n\t\treturn nil, errors.New(\"gremlin/http: missing query expression\")\n\t}\n\n\tpr, pw := io.Pipe()\n\tdefer pr.Close()","sourceCodeStart":11,"sourceCodeEnd":47,"githubUrl":"https://github.com/ent/ent/blob/69d5d4deb19599f129166634e09d33addcf3f2cc/dialect/gremlin/http.go#L11-L47","documentation":"NewHTTPTransport (dialect/gremlin/http.go:29) parses the Gremlin server endpoint URL with url.Parse and wraps any parse failure as \"gremlin/http: parsing url\". It is raised at transport construction time, before any network activity.","triggerScenarios":"Calling gremlin.NewHTTPTransport with a malformed URL string (missing scheme, invalid characters, control characters) — returned immediately by the constructor.","commonSituations":"Config values built by string concatenation (host:port without http://), env vars containing whitespace or quotes, mistyped URLs like 'http:/host' or 'localhost:8182' with an unexpected scheme.","solutions":["Print the URL string from the error context and fix the format; ensure a valid scheme like http:// or https://.","Trim whitespace/quotes from configuration or environment variables before passing them.","Validate the URL with url.ParseRequestURI in your own config-loading code before constructing the transport.","Use url.URL construction or net.JoinHostPort instead of ad-hoc string concatenation."],"exampleFix":"// before\ntr, err := gremlin.NewHTTPTransport(\"localhost:8182\", nil)\n// after\ntr, err := gremlin.NewHTTPTransport(\"http://localhost:8182\", nil)","handlingStrategy":"validation","validationCode":"u, err := url.ParseRequestURI(cfg.Endpoint)\nif err != nil || u.Scheme == \"\" || u.Host == \"\" {\n    return fmt.Errorf(\"invalid gremlin endpoint %q\", cfg.Endpoint)\n}","typeGuard":null,"tryCatchPattern":"tr, err := gremlin.NewHTTPTransport(cfg.Endpoint, nil)\nif err != nil {\n    return fmt.Errorf(\"gremlin endpoint config invalid: %w\", err)\n}","preventionTips":["Validate endpoint URLs at config-load time with url.ParseRequestURI.","Trim whitespace/quotes from env-provided URLs.","Build URLs from host/port with net.JoinHostPort plus an explicit scheme."],"tags":["url","http","configuration","gremlin"],"backgroundTag":"invalid-url","analyzedSha":"69d5d4deb19599f129166634e09d33addcf3f2cc","analyzedAt":"2026-09-03T16:51:39.799Z","contentChangedAt":"2026-09-03T16:51:39.799Z","schemaVersion":2},"datasetVersion":"2026-09-11T00:17:11.886Z"}