HTTP Interfaces and External Systems for Minor Metals

What the data for this category looks like

This category’s data sources primarily include weekly segmented category reports from the National Nonferrous Metals Industry Association, minor metals contract market data from the Shanghai Futures Exchange, and spot quotes from third-party industry information platforms. There are three update cadences: spot quotes are updated daily, industry production and inventory statistics are updated weekly, and import and export data is updated monthly. Document structures center on standardized data modules, including fields such as regional production distribution, daily average spot price, monthly production, and total inventory. Some data sources include custom fields such as environmental compliance level and production site registration number. Price fields mostly use yuan/kilogram or US dollars/ton as units. Production and inventory fields use tons as units.

Constraints on HTTP Interfaces and External Systems

Minor metals data sources have differing update cadences. Interfaces must support configurable pull cycles tailored to each source to avoid excessive requests or outdated data. Field names and units vary across different data sources. For example, spot prices use both yuan/kilogram and US dollars/ton as labels. The interface layer must include built-in custom field mapping and unit conversion logic to ensure downstream systems receive standardized, unified data. Market data for some minor metal categories has extremely high timeliness requirements. Interface response timeout thresholds must be lower than those for general nonferrous metal categories to prevent returning non-real-time information.

Configuration Settings

Configuration Item	Recommended Value	Rationale
`HTTP_REQUEST_TIMEOUT`	`30 seconds`	Minor metal spot data has high timeliness requirements; the timeout threshold must be lower than general categories to avoid waiting for outdated data to return
`DATA_SYNC_CRON`	`0 0/6 * * ` (spot data), `0 0 * 1` (weekly statistics)	Matches the update frequencies of different data sources: daily spot data is synchronized every 6 hours, weekly statistics are synchronized every Monday
`CUSTOM_FIELD_MAPPING`	`{"spot_price": "当日现货均价", "unit": "元/千克"}`	Adapts to the non-standard field naming of minor metal data sources, mapping fields returned by external interfaces to standard due diligence report fields
`UNIT_CONVERSION_RULE`	`{"美元/吨": "元/千克 * 7.2 / 1000"}`	Unifies price units across different data sources to eliminate cross-platform data discrepancies
`MAX_RETRY_TIMES`	`2 retries`	Some minor metal data source interfaces have average stability; limited retries can reduce synchronization failure rates and avoid resource occupation from repeated requests

The parameter values provided on this page are common starting points for configuration. Actual values are affected by material form, data volume, and business rules. Specific issues require specific analysis, and testing against local samples is recommended before finalizing settings.

Three Common Mistakes

Symptom: Bound external interfaces return 404 page not found. Cause: Exclusive path parameters for minor metals (such as sub_metal=antimony) were not added to the interface configuration. This causes requests to target general nonferrous metal interface endpoints.
Symptom: Price fields still show inconsistent units after configuring UNIT_CONVERSION_RULE. Cause: The field associated with the conversion rule was not linked in CUSTOM_FIELD_MAPPING. This prevents the unit conversion logic from taking effect.
Symptom: Tests of configured third-party large model APIs return 400 Bad Request. Cause: Request bodies were not formatted per the field requirements of minor metals due diligence reports. Non-standard fields were passed to the interface, causing format verification failures.

How to Confirm the Configuration is Complete

Call the configured HTTP interface and check if the returned fields include the minor metal-exclusive sub_metal_code and spot_unit fields. This confirms the data source mapping is correct.
Manually trigger a data synchronization and check for unit conversion-related success identifiers in the synchronization log. This confirms the conversion rules are active.
Compare raw data returned by external interfaces with field values in due diligence reports. This confirms custom mapping configurations were executed correctly.
Simulate a single request and check if the interface returns results within the preset timeout configuration duration. This confirms the timeout setting meets requirements.

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.