{"record":{"id":"8c3e67cbfeeffadb","repo":"hasura/graphql-engine","slug":"error-while-building-the-request-for-the-pre-parse-8c3e67","errorCode":null,"errorMessage":"Error while building the request for the pre-parse plugin {0} - {1}","messagePattern":"Error while building the request for the pre-parse plugin (.+?) - (.+?)","errorType":"exception","errorClass":"Error","httpStatus":null,"severity":"error","filePath":"v3/crates/plugins/pre-route-plugin/src/execute.rs","lineNumber":24,"sourceCode":"};\nuse http_body_util::BodyExt;\nuse regex::Regex;\nuse serde::Serialize;\n\nuse open_dds::plugins::{\n    LifecyclePreRoutePluginHook, LifecyclePreRoutePluginHookConfigRequestMethod,\n    LifecyclePreRoutePluginHookIncomingHTTPMethod,\n};\nuse serde_json::json;\nuse tracing_util::{\n    ErrorVisibility, SpanVisibility, Traceable, TraceableError, set_attribute_on_active_span,\n};\n\n#[derive(Debug, thiserror::Error)]\npub enum Error {\n    #[error(\"Error while making the HTTP request to the pre-parse plugin {0} - {1}\")]\n    ErrorWhileMakingHTTPRequestToTheHook(String, reqwest::Error),\n    #[error(\"Error while building the request for the pre-parse plugin {0} - {1}\")]\n    BuildRequestError(String, String),\n    #[error(\"Reqwest error: {0}\")]\n    ReqwestError(reqwest::Error),\n    #[error(\"Unexpected status code: {0}\")]\n    UnexpectedStatusCode(u16),\n    #[error(\"Error parsing the request: {0}\")]\n    PluginRequestParseError(serde_json::error::Error),\n    #[error(\"HTTP method {0} not supported\")]\n    UnsupportedHTTPMethod(String),\n    #[error(\"Invalid header name {0}\")]\n    InvalidHeaderName(String),\n    #[error(\"Invalid header value {0}\")]\n    InvalidHeaderValue(String),\n    #[error(\"Not found\")]\n    NotFound,\n    // Only used in the pre-route plugin handler function. Defined to ensure consistent\n    // response formatting in IntoResponse impl.\n    #[error(\"Cannot load pre-route plugins: {0}\")]","sourceCodeStart":6,"sourceCodeEnd":42,"githubUrl":"https://github.com/hasura/graphql-engine/blob/724551b9ae87845594ef0408cff0e50eb6c90dc5/v3/crates/plugins/pre-route-plugin/src/execute.rs#L6-L42","documentation":"The pre-route plugin could not build the HTTP request to its hook — invalid URL or builder-rejected headers/body. The message says 'pre-parse plugin' (shared wording) but it originates in the pre-route executor; {1} carries the specific reason.","triggerScenarios":"Malformed hook URL for the pre-route plugin, or invalid header name/value being set when constructing the outgoing request.","commonSituations":"Config typo in the hook URL; env-substituted URL containing trailing whitespace/newline; dynamic headers with invalid characters.","solutions":["Read the {1} field to see why the builder rejected the request.","Validate the URL at config load with url::Url::parse.","Trim/normalize env-provided URLs and headers."],"exampleFix":"// before\nlet url = std::env::var(\"PRE_ROUTE_HOOK_URL\")?;\n\n// after\nlet url = std::env::var(\"PRE_ROUTE_HOOK_URL\")?.trim().to_string();\nurl::Url::parse(&url)?;","handlingStrategy":"validation","validationCode":"let u = url::Url::parse(cfg.pre_route_hook_url.trim())?;\nassert!(u.scheme().starts_with(\"http\"));","typeGuard":null,"tryCatchPattern":null,"preventionTips":["Validate the hook URL at config load.","Never build URLs by string concatenation without validation.","Test request construction in unit tests for each plugin config."],"tags":["http","validation","plugin","rust","pre-route-hook"],"backgroundTag":"invalid-url","analyzedSha":"724551b9ae87845594ef0408cff0e50eb6c90dc5","analyzedAt":"2026-08-28T07:32:55.105Z","schemaVersion":2},"datasetVersion":"2026-08-28T11:17:15.048Z"}