Data Characteristics of This Category
The data for energy metals financing daily reports is sourced from domestic professional information institutions in the non-ferrous metals industry, publicly disclosed supply chain financing and warehouse receipt pledge data from the interbank market, and public information on warehouse receipt circulation from exchanges. Data is released in full for the current day at fixed daily times.
The data uses a structured format, including fields such as report date, energy metal category, financing amount, financing term, pledge product grade, fund usage, and publishing institution. The unit for financing amount is ten thousand yuan RMB. The unit for financing term is calendar days. Pledge product grades are identified by classifications such as industrial grade and battery grade.
Constraints for HTTP Interfaces and External Systems
The wide coverage and numerous sub-categories of energy metals require HTTP interfaces to support multi-dimensional category filter parameters, to avoid returning redundant full datasets.
The fixed daily update feature requires that the interface cache validity period does not exceed 24 hours, to ensure the latest current day data is returned.
Since the units and classifications of structured fields are fixed, the interface must strictly verify the matching between filter parameters and field enumeration values, to block invalid requests.
Due to the multi-data source aggregation characteristic, external systems must handle empty fields in interface responses to avoid parsing errors. Additionally, numeric fields for financing amount and term must support range filter parameters, to meet the data analysis needs of external systems.
Configuration Settings
| Configuration Item | Recommended Value | Rationale |
|---|---|---|
API_CACHE_TTL | 86400 seconds | Matches the daily update schedule of energy metals financing daily reports, ensures the latest current day data is returned |
REQUEST_FILTER_LIST | ["Lithium", "Cobalt", "Nickel", "Rare Earth"] | Covers mainstream sub-categories of energy metals, matches the classification enumeration of the data source, reduces invalid returned data |
FIELD_VALIDATION_MODE | strict | The units and classifications of structured fields are fixed. Strict validation blocks invalid requests and parameter errors |
EMPTY_FIELD_HANDLER | return_null_with_warn | Adapts to the multi-data source aggregation characteristic, handles empty field cases, and facilitates parsing by external systems |
RATE_LIMIT_CONFIG | 100 times per minute | Matches the daily report data volume and external system call frequency, prevents interface overload |
RESPONSE_CONTENT_TYPE | application/json | Meets the transmission and parsing needs of structured data, and is compatible with the parsing logic of most external systems |
The parameter values provided on this page are common starting points for configuration setup. Actual values are affected by material form, data volume and business rules. Each scenario requires individual analysis. It is recommended to test on your own samples before finalizing settings.
Common Misconfigurations and Their Causes
- Scenario: After deploying on a local Linux server and calling the interface, the interface remains in a loading state and configuration cannot be completed. Cause: The server firewall does not open the port corresponding to the interface, or the outbound rule blocks requests for API key verification, which prevents the configuration process from completing.
- Scenario: When accessing via a penetration service over the public network, the interface returns a
403 Forbiddenstatus code. Cause: The allowed access IP whitelist configured for the interface does not include the public network IP obtained after penetration, so the request is blocked. - Scenario: The financing data returned after calling the interface does not match the daily report released on the same day. Cause: The cache validity period is set to more than 24 hours, so old data from the previous day is returned, which does not match the daily update schedule.
How to Verify Successful Configuration
- Call the interface with preset category filter parameters, and check whether the categories of the returned data match the filter conditions.
- View the interface response header, and confirm that the validity period of the
Cache-Controlfield matches the configured cache parameter. - Construct a mock request with missing fields, and verify that the empty field processing result returned by the interface meets the configured requirements.
- Test requests from non-allowed IP addresses, confirm that the interface returns the corresponding blocked status code, and verify that the whitelist configuration takes effect.
Question material comes from public community discussions. Configuration values are common starting points and should be measured against your own samples. Verified on 2026-09-14.