{"record":{"id":"a4abc27fb8d9ae05","repo":"hasura/graphql-engine","slug":"error-while-making-the-http-request-to-the-pre-par-a4abc2","errorCode":null,"errorMessage":"Error while making the HTTP request to the pre-parse plugin {0} - {1}","messagePattern":"Error while making the HTTP request to the pre-parse plugin (.+?) - (.+?)","errorType":"exception","errorClass":"Error","httpStatus":null,"severity":"error","filePath":"v3/crates/plugins/pre-response-plugin/src/execute/common.rs","lineNumber":17,"sourceCode":"use std::{collections::BTreeMap, str::FromStr};\n\nuse axum::{\n    http::{HeaderMap, HeaderName, StatusCode},\n    response::IntoResponse,\n};\n\nuse hasura_authn_core::Session;\nuse lang_graphql::{ast::common as ast, http::RawRequest};\nuse open_dds::plugins::{LifecyclePluginUrl, LifecyclePreResponsePluginHookConfigRequest};\nuse reqwest::header::HeaderValue;\nuse serde::Serialize;\nuse tracing_util::{ErrorVisibility, TraceableError};\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(\"Error parsing the request: {0}\")]\n    PluginRequestParseError(serde_json::Error),\n    #[error(\"Error parsing the engine response: {0}\")]\n    EngineResponseParseError(serde_json::Error),\n    #[error(\"Unexpected status code: {0}\")]\n    UnexpectedStatusCode(u16),\n    #[error(\"Error serializing the modified response: {0}\")]\n    ResponseSerializationError(serde_json::Error),\n    #[error(\"Error while preparing the response: {0}\")]\n    ResponsePreparationError(axum::http::Error),\n}\n\nimpl TraceableError for Error {","sourceCodeStart":1,"sourceCodeEnd":35,"githubUrl":"https://github.com/hasura/graphql-engine/blob/724551b9ae87845594ef0408cff0e50eb6c90dc5/v3/crates/plugins/pre-response-plugin/src/execute/common.rs#L1-L35","documentation":"The pre-response plugin executor failed to make the HTTP request to its hook endpoint at the transport level (connect error, timeout, DNS). Note the message text says 'pre-parse plugin' but the variant lives in the pre-response plugin's error enum — the wording is copy-pasted between crates. Fields are the hook URL and the underlying reqwest::Error.","triggerScenarios":"A pre-response plugin is configured and the engine, after producing a response, tries to call the hook and the connection fails (service down, wrong port, timeout).","commonSituations":"Pre-response hook service scaled to zero or crashed; wrong service name in config; network policy blocking engine→plugin traffic only for that endpoint.","solutions":["Confirm the pre-response hook service is up and reachable from the engine pod/host.","Fix the hook URL in plugin configuration.","Check DNS/firewall/service-mesh rules for the plugin route.","Raise the hook timeout if the plugin legitimately needs longer."],"exampleFix":null,"handlingStrategy":"retry","validationCode":"async fn hook_up(url: &str) -> bool {\n    reqwest::Client::new().get(url).send().await.is_ok()\n}","typeGuard":null,"tryCatchPattern":"Err(Error::ErrorWhileMakingHTTPRequestToTheHook(_, ref re)) if re.is_connect() => {\n    // hook down: log, retry with backoff, or fail open\n}","preventionTips":["Health-check the pre-response hook before traffic.","Deploy hook and engine together; use service readiness gates.","Set sane timeouts so a hung hook doesn't stall responses."],"tags":["network","http","plugin","rust","pre-response-hook"],"backgroundTag":"http-request-failed","analyzedSha":"724551b9ae87845594ef0408cff0e50eb6c90dc5","analyzedAt":"2026-08-28T07:32:55.105Z","schemaVersion":2},"datasetVersion":"2026-08-28T11:17:15.048Z"}