{"record":{"id":"7210285861f01a49","repo":"OpenBB-finance/OpenBB","slug":"an-error-occurred-while-fetching-constraints-data","errorCode":null,"errorMessage":"An error occurred while fetching constraints {dataflow_id}: {e} -> {url}","messagePattern":"An error occurred while fetching constraints (.+?): (.+?) -> (.+?)","errorType":"http","errorClass":"OpenBBError","httpStatus":null,"severity":"error","filePath":"openbb_platform/providers/imf/openbb_imf/utils/metadata.py","lineNumber":751,"sourceCode":"            if query_params\n            else base_url\n        )\n        json_response: dict = {}\n        try:\n            headers = {\n                \"Accept\": \"application/json\",\n                \"User-Agent\": \"Open Data Platform - IMF Metadata Utility\",\n            }\n            response = make_request(url, headers=headers)\n            response.raise_for_status()\n            json_response = response.json()\n        except json.JSONDecodeError as e:\n            raise OpenBBError(\n                f\"Unexpected response format when fetching constraints {dataflow_id}: {e}\"\n                + f\" -> {url}\"\n            ) from None\n        except RequestException as e:\n            raise OpenBBError(\n                f\"An error occurred while fetching constraints {dataflow_id}: {e} -> {url}\"\n            ) from None\n\n        extracted_values: dict = {}\n        json_data = json_response.get(\"data\", {})\n        data_constraints = json_data.get(\"dataConstraints\", [])\n\n        for constraint in data_constraints:\n            for region in constraint.get(\"cubeRegions\", []):\n                for kv in region.get(\"keyValues\", []):\n                    dim_id = kv.get(\"id\")\n                    if dim_id:\n                        if dim_id not in extracted_values:\n                            extracted_values[dim_id] = []\n                        for val in kv.get(\"values\", []):\n                            if isinstance(val, dict):\n                                extracted_values[dim_id].append(val.get(\"value\"))\n                            else:","sourceCodeStart":733,"sourceCodeEnd":769,"githubUrl":"https://github.com/OpenBB-finance/OpenBB/blob/3e071fcc2cd9f891cac6040ae60296dba76dab46/openbb_platform/providers/imf/openbb_imf/utils/metadata.py#L733-L769","documentation":"Thrown by IMFSDMXMetadata when the HTTP request to the IMF SDMX 'constraints' endpoint for a dataflow raises a requests RequestException (connection failure, DNS error, timeout, or raise_for_status() 4xx/5xx). The message wraps the original exception text plus the offending URL so the failing call can be reproduced manually. It surfaces as an OpenBBError from the IMF provider's metadata layer.","triggerScenarios":"Calling any IMF SDMX-based fetcher (e.g. get_dataflow_parameters / indicator discovery for dataflows like 'FSIBSIS' or 'BOP_AGG') while the IMF API is unreachable, rate-limiting (HTTP 429), returning 5xx, or when a proxy/firewall blocks the request to the IMF JSON REST endpoint shown in {url}.","commonSituations":"Transient IMF server outages or maintenance windows, corporate proxies intercepting requests, rate limits after bulk metadata crawling, typos in dataflow_id that lead to a 404 from the constraints endpoint.","solutions":["Retry after a short delay — IMF SDMX endpoints intermittently fail with 5xx; a single retry usually succeeds.","Verify network reachability of the exact URL printed in the message (curl it) to distinguish proxy/firewall blocks from IMF-side errors.","If HTTP 429, slow down or add caching/backoff before re-crawling many dataflows.","Confirm dataflow_id is a valid IMF dataflow (it appears in the URL) — an invalid ID yields a 404 RequestException."],"exampleFix":"// before\nparams = metadata.get_dataflow_parameters('FSIBSIS')  # raises OpenBBError on RequestException\n\n// after\nfrom time import sleep\nfor attempt in range(3):\n    try:\n        params = metadata.get_dataflow_parameters('FSIBSIS')\n        break\n    except OpenBBError as e:\n        if attempt == 2 or '429' not in str(e):\n            raise\n        sleep(2 ** attempt)","handlingStrategy":"retry","validationCode":"import requests\nurl = constraints_url_for(dataflow_id)  # the URL printed in the error\ntry:\n    r = requests.head(url, timeout=10)\n    ok = r.status_code == 200\nexcept requests.RequestException:\n    ok = False\nif not ok:\n    print('IMF constraints endpoint unreachable; deferring fetch')","typeGuard":null,"tryCatchPattern":"try:\n    params = meta.get_dataflow_parameters(dataflow_id)\nexcept OpenBBError as e:\n    if 'fetching constraints' in str(e):\n        # transient network/HTTP failure: safe to retry with backoff\n        raise RetryableError(str(e)) from e\n    raise","preventionTips":["Cache constraints per dataflow_id (the class already does via _constraints_cache) so retries are rare.","Rate-limit bulk metadata crawls to avoid IMF 429s.","Log the full URL from the message to reproduce failures deterministically."],"tags":["imf","sdmx","network","http","metadata"],"backgroundTag":null,"analyzedSha":"3e071fcc2cd9f891cac6040ae60296dba76dab46","analyzedAt":"2026-08-14T23:40:48.960Z","schemaVersion":2},"datasetVersion":"2026-08-15T17:31:12.345Z"}