HTTP Interfaces and External Systems for Industrial Metal

Data Structure of This Category

Data for industrial metal financing daily reports comes primarily from official warehouse receipt announcements published by the Shanghai Futures Exchange and London Metal Exchange, plus financing transaction data from domestic non-ferrous metal industry circulation monitoring platforms. The system summarizes and updates data daily at midnight. Each daily report includes fields such as trading variety, warehouse stock volume, pledged financing scale, and number of daily financing transactions. The variety field specifies the specific metal type and delivery grade. Warehouse stock volume is measured in tons. Financing scale is measured in ten thousand RMB. Update times are accurate to midnight of the current day.

Constraints on HTTP Interfaces and External Systems

The fixed daily update schedule for industrial metal financing daily reports requires interfaces to support incremental data pulls based on timestamps, to avoid retrieving expired data repeatedly. Field naming differences across multiple exchanges require interfaces to support custom field mapping rules. For example, some overseas exchanges use the field name registered_stock for warehouse stock volume, which differs from domestic standard field names. Each daily report contains full data for dozens of industrial metal varieties. Interfaces must support pagination returns by variety code, to reduce per-request transmission load. Cross-regional pricing unit differences for financing scale require interfaces to provide unit conversion parameters, to support scenarios using RMB or USD pricing.

Configuration Settings

Configuration Item	Recommended Setting	Rationale
`CORS_ALLOW_ORIGINS`	Specify a list of business domain names, or `*` (test environments only)	Match access sources of external systems, to prevent cross-origin requests from being blocked
`FETCH_INTERVAL`	`86400 seconds`	Match the daily update schedule of industrial metal financing daily reports, to reduce unnecessary data pulls
`FIELD_MAPPING_RULE`	Custom field mapping	Adapt to field naming differences across exchanges. For example, map `registered_stock` to `warehouse_stock_tons`
`PAGE_SIZE`	`10–20 entries`	Match the fact that each daily report contains dozens of industrial metal varieties, reduce per-request transmission load
`UNIT_CONVERT_SWITCH`	Enabled	Adapt to scenarios where industrial metal financing daily reports use RMB or USD pricing, unify output units
`TIMESTAMP_VALIDATION`	Enabled	Verify that the timestamp of pulled data matches the daily update cycle, avoid retrieving expired data

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. It is recommended to test on your own samples before finalizing settings.

Three Common Mistakes

Phenomenon: The interface returns a 403 Forbidden status code, or the browser console displays a cross-origin request blocked error. Cause: The CORS_ALLOW_ORIGINS parameter is not configured correctly, and the external system's access domain name is not added to the allowlist.
Phenomenon: When passing a variable for the financing scale field, the interface returns a field format error response. Manually concatenating a fixed value works normally. Cause: No field mapping rule is configured, and the field name passed in the variable does not match the standard field name required by the interface. For example, passing financing_amount instead of the required pledged_financing_scale.
Phenomenon: After local deployment, the generated login-free link remains http://localhost:3000/chat/, and cannot be accessed via public network HTTPS. Cause: The certificate path generated by mkcert is not configured in the server's HTTPS startup parameters, and the public network domain name is not bound.

How to Verify Successful Configuration

Call the interface to retrieve a single data entry, check that the returned field names match the custom mapping rules, to confirm the field mapping configuration is active.
Send a cross-origin request, check the browser console or the interface's returned status code, to confirm cross-origin configuration does not block requests.
Pull the daily industrial metal financing report data for the current day, check that the data update time matches midnight of the current day, to confirm the timestamp validation configuration is active.
Pass a variable parameter with a unit, check that the returned financing scale unit matches the preset unified standard, to confirm the unit conversion configuration is active.

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.