{"id":"e20980199f3c7a87","repo":"gofiber/fiber","slug":"failed-to-dump-request-w","errorCode":null,"errorMessage":"failed to dump request: %w","messagePattern":"failed to dump request: %w","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"app.go","lineNumber":1423,"sourceCode":"\t}\n\n\t// Ensure Host header is present in the dump (required by fasthttp)\n\tif req.Host == \"\" {\n\t\tif req.URL != nil && req.URL.Host != \"\" {\n\t\t\treq.Host = req.URL.Host\n\t\t} else {\n\t\t\treq.Host = \"localhost\"\n\t\t}\n\t}\n\n\t// Clear RequestURI so DumpRequest writes origin-form request line with\n\t// Host header instead of absolute-form URI without Host header.\n\treq.RequestURI = \"\"\n\n\t// Dump raw http request\n\tdump, err := httputil.DumpRequest(req, true)\n\tif err != nil {\n\t\treturn nil, fmt.Errorf(\"failed to dump request: %w\", err)\n\t}\n\n\t// Create test connection\n\tconn := new(testConn)\n\n\t// Write raw http request\n\tif _, err = conn.r.Write(dump); err != nil {\n\t\treturn nil, fmt.Errorf(\"failed to write: %w\", err)\n\t}\n\t// prepare the server for the start\n\tapp.startupProcess()\n\n\t// Serve conn to server\n\tchannel := make(chan error, 1)\n\tgo func() {\n\t\tvar returned bool\n\t\tdefer func() {\n\t\t\tif !returned {","sourceCodeStart":1405,"sourceCodeEnd":1441,"githubUrl":"https://github.com/gofiber/fiber/blob/9a4c7e57fe0b080a04235d28a4b0d2b4b353d58c/app.go#L1405-L1441","documentation":"Returned by App.Test (app.go:1423) when httputil.DumpRequest(req, true) fails while serializing the *http.Request into the raw bytes fed to the in-process server. DumpRequest fails on malformed requests — invalid method, un-writable headers, an unreadable Body marked for dumping. Test is the helper used to drive a Fiber app without opening a real port.","triggerScenarios":"Calling app.Test(req) with a request built incorrectly: req with an invalid Method, header values containing control characters, a Body that errors on Read while DumpRequest reads it, or nil fields where DumpRequest expects structure.","commonSituations":"Unit tests hand-constructing http.Request instead of using http.NewRequest; stubbing Body with a broken reader; edge cases with Content-Length mismatches.","solutions":["Build requests with http.NewRequest(http.MethodGet, url, body) so method/URL are valid.","If dumping the body is the problem, pass a request whose Body is http.NoBody or set TestConfig accordingly; avoid bodies that error on read.","Inspect the wrapped error to identify which header/field DumpRequest rejected."],"exampleFix":"// before\nreq := &http.Request{Method: \"BOGUS\"}\napp.Test(req)\n\n// after\nreq, _ := http.NewRequest(http.MethodGet, \"/\", nil)\napp.Test(req)","handlingStrategy":"validation","validationCode":"// Build requests with http.NewRequest so method/URL/headers are valid.\nreq, err := http.NewRequest(http.MethodPost, \"/api\", bytes.NewReader(body))\nif err != nil { return err }\nreq.Header.Set(\"Content-Type\", \"application/json\")\n_, err = app.Test(req)","typeGuard":null,"tryCatchPattern":"resp, err := app.Test(req)\nif err != nil {\n    if strings.Contains(err.Error(), \"failed to dump request\") {\n        // request is malformed — fix construction\n    }\n    return err\n}","preventionTips":["Always build *http.Request via http.NewRequest (or http.NewRequestWithContext).","Avoid Body readers that error on Read when Test must dump the body.","Validate Method against valid HTTP verbs before passing to Test."],"tags":["testing","http","request","test-helper"],"analyzedSha":"9a4c7e57fe0b080a04235d28a4b0d2b4b353d58c","analyzedAt":"2026-08-04T21:44:03.395Z","schemaVersion":2}