{"record":{"id":"4abf79ad99a85a50","repo":"alibaba/spring-ai-alibaba","slug":"fetch-attempt-failed-for-url","errorCode":null,"errorMessage":"Fetch attempt {} failed for URL: {}: {}","messagePattern":"Fetch attempt (.+?) failed for URL: (.+?): (.+?)","errorType":"console","errorClass":null,"httpStatus":null,"severity":"warning","filePath":"spring-ai-alibaba-agent-framework/src/main/java/com/alibaba/cloud/ai/graph/agent/tools/WebFetchTool.java","lineNumber":260,"sourceCode":"\n\t\t\t\tHttpResponse<String> response = fetchHtml(url);\n\n\t\t\t\tif (response.statusCode() >= 500 && response.statusCode() < 600) {\n\t\t\t\t\tlastException = new WebFetchException(\"Server error: HTTP \" + response.statusCode(), null);\n\t\t\t\t\tlogger.warn(\"Fetch attempt {} returned server error {} for URL: {}\", attempt + 1,\n\t\t\t\t\t\t\tresponse.statusCode(), url);\n\t\t\t\t\tattempt++;\n\t\t\t\t\tcontinue;\n\t\t\t\t}\n\n\t\t\t\treturn response;\n\t\t\t}\n\t\t\tcatch (WebFetchException e) {\n\t\t\t\tlastException = e;\n\t\t\t\tif (e.getCause() instanceof InterruptedException) {\n\t\t\t\t\tthrow e;\n\t\t\t\t}\n\t\t\t\tlogger.warn(\"Fetch attempt {} failed for URL: {}: {}\", attempt + 1, url, e.getMessage());\n\t\t\t\tattempt++;\n\t\t\t}\n\t\t\tcatch (InterruptedException e) {\n\t\t\t\tThread.currentThread().interrupt();\n\t\t\t\tthrow new WebFetchException(\"Retry interrupted\", e);\n\t\t\t}\n\t\t}\n\n\t\tif (lastException == null) {\n\t\t\tthrow new WebFetchException(\"Failed after \" + (this.maxRetries + 1) + \" attempts\", null);\n\t\t}\n\t\telse if (lastException instanceof WebFetchException) {\n\t\t\tthrow new WebFetchException(\"Failed after \" + (this.maxRetries + 1) + \" attempts\", lastException);\n\t\t}\n\t\telse {\n\t\t\tthrow new WebFetchException(\n\t\t\t\t\t\"Failed after \" + (this.maxRetries + 1) + \" attempts: \" + lastException.getMessage(),\n\t\t\t\t\tlastException);","sourceCodeStart":242,"sourceCodeEnd":278,"githubUrl":"https://github.com/alibaba/spring-ai-alibaba/blob/f82da0b50f35744c13968191be2b1cd2452ef550/spring-ai-alibaba-agent-framework/src/main/java/com/alibaba/cloud/ai/graph/agent/tools/WebFetchTool.java#L242-L278","documentation":"fetchHtmlWithRetry logs this warning when an individual fetch attempt to the target URL throws a WebFetchException (excluding interrupts) and will retry up to the configured attempt count. The final failure surfaces only after all retries are exhausted.","triggerScenarios":"HTTP connection errors, TLS failures, DNS resolution failures, or non-success responses when fetching the given URL, on attempt 'attempt+1' of the retry loop.","commonSituations":"Fetching an internal/localhost URL from a container without network access, target site rate limiting or blocking the agent's user agent, transient network flaps, invalid TLS certs on intranet hosts.","solutions":["Read the cause in the message to identify the underlying network/HTTP problem and fix connectivity (DNS, proxy, firewall).","Verify the URL is reachable from the runtime environment (curl it from the same host/container).","Increase retry count/backoff in WebFetchTool config for flaky targets.","If the target blocks bots, ensure allowed domains and appropriate headers/user agent are configured."],"exampleFix":null,"handlingStrategy":"retry","validationCode":"new URL(url); // and curl-check reachability from the runtime host before wiring the tool","typeGuard":null,"tryCatchPattern":"try { html = webFetch.fetch(url); } catch (WebFetchException e) { log.error(\"All retries failed for {}: {}\", url, e.getMessage()); return fallbackContent(url); }","preventionTips":["Verify the URL is reachable from the deployment environment (proxy/DNS/firewall).","Configure sensible retry counts and backoff for flaky targets.","Only allowlist domains you control or trust to avoid bot-blocking."],"tags":["http","network","retry","webfetch"],"backgroundTag":"http-request-failed","analyzedSha":"f82da0b50f35744c13968191be2b1cd2452ef550","analyzedAt":"2026-09-09T15:32:42.421Z","contentChangedAt":"2026-09-09T15:32:42.421Z","schemaVersion":2},"datasetVersion":"2026-09-14T05:17:10.506Z"}