What the Data for This Category Looks Like
Industrial metal market data comes primarily from official APIs of domestic and overseas futures exchanges and industry news aggregation services. Official sources push real-time market snapshots during trading sessions throughout the trading day. A consolidated yield summary packet for all varieties is created daily after market close. Historical archived data is available only on non-trading days. The interface returns data in a standardized JSON array format. Each entry includes fields such as variety identifier, trading market, daily benchmark price, daily settlement price, yield change value, update timestamp, and more. Price units include yuan per metric ton for domestic varieties and US dollars per metric ton for overseas varieties. Timestamps use UTC format.
What Constraints Do These Characteristics Impose on HTTP Interfaces and External Systems
Multiple data sources have cross-domain and unit differences, requiring HTTP interfaces to support multi-domain switching and unified unit conversion configuration. High-frequency updates and large consolidated summary packet sizes mean interfaces must adapt to rate limiting rules and response compression configurations to avoid timeouts or excessive bandwidth usage. There are many industrial metal varieties, so the interface must support filtering by variety code. Otherwise, the returned data volume will exceed the parsing limits of external systems. The scenario of no new data on non-trading days requires external systems to handle empty data returns to avoid triggering abnormal error messages.
How to Configure the Settings
| Configuration Item | Recommended Setting | Rationale |
|---|---|---|
request_timeout | 30-60 seconds | Industrial metal market interface consolidated summary packets have large size; too short a timeout will cause data truncation |
max_retries | 3-5 attempts | Exchange interfaces occasionally enforce rate limits; retries cover most temporary exception scenarios |
accept_encoding | gzip, deflate | Compress response content to reduce network transmission time and bandwidth consumption |
symbol_filter | Comma-separated target variety codes | Industrial metal varieties cover multiple categories such as copper, aluminum, zinc, etc. Filtering as needed reduces data parsing pressure |
polling_interval | 600 seconds | Matches the regular update frequency of data sources during trading days; prevents excessive requests from triggering rate limits |
unit_conversion_enabled | Enabled | Unify price units across domestic and overseas markets to adapt to the parsing rules of external systems |
The parameter values provided on this page are common recommended starting points for configuration. Actual values are affected by material form, data volume, and business rules. Specific issues require individual analysis. It is recommended to test on your own samples before finalizing settings.
Three Common Configuration Errors
- External systems receive duplicate yield data entries when the polling interval does not match the data source update frequency, causing the same batch of data to be pulled multiple times.
- Empty interface return fields or parsing failures occur when the
symbol_filterparameter is not configured, and the full variety data return volume exceeds the memory parsing limits of external systems. - External systems receive a
429 Too Many Requestsstatus code when the polling interval is set too short, exceeding the rate limiting threshold of the exchange interface and triggering access restrictions.
How to Verify Proper Configuration
- Invoke the configured HTTP interface, and confirm that returned fields include expected fields such as
symbol,price_change,update_time, and others. - Simulate a request on a non-trading day, and confirm that the interface returns an empty array or historical archived data, with no abnormal error messages.
- Enable unit conversion configuration, and verify that returned price units match the format required by the external system.
- Adjust the
symbol_filterparameter to a specified variety code, and confirm that the interface only returns yield data for the corresponding category.
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.