HTTP Interfaces and External Systems for Steel Trade

What This Category of Data Looks Like

Data sources for steel trade intelligent due diligence reports include industry association public spot price ledgers, port customs clearance and delivery records, steel mill shipment details, and procurement orders from downstream manufacturing and construction industries. Update frequencies vary: spot prices update daily, industry inventory updates weekly, and total trade volume updates monthly. Documents primarily use structured tables, with fields including trading entity qualifications, goods specifications (grade, thickness, width), transaction unit price (yuan/ton), delivery location, payment term, and other fields. Some reports include attachments such as steel mill quality inspection reports and customs documents.

What Constraints Do These Characteristics Impose on HTTP Interfaces and External Systems

Multi-source data with inconsistent update cycles requires HTTP interfaces to support pulling different data sources by cycle, and adapt to daily, weekly, and monthly sync task configurations. Specialized fields and specifications require interfaces to support custom field validation and return, to avoid generic parameters failing to cover steel trade specific data items. Large-volume attachments and long text content require interfaces to have large file parsing capabilities and reasonable timeout settings, to prevent data transfer and parsing interruptions. Cross-region delivery and commercial sensitivity require interface cross-origin access restrictions to protect data security.

How to Set Configurations

Configuration Item	Recommended Setting	Rationale
`API_REQUEST_TIMEOUT`	`600 seconds`	Steel trade due diligence data involves multi-source pulling and multi-field integration. Single report generation cycles are long, and 600 seconds covers the full data processing workflow
`RECALL_TOP_K`	`Top 8-12 entries`	Steel trade data has high matching accuracy requirements for material, specification, and other fields. Too many recalls introduce irrelevant data, while too few fail to cover valid information
`PARSE_FILE_MAX_SIZE`	`2000 MB`	Steel trade due diligence reports often include large attachments such as steel mill quality inspection reports and customs documents. This setting adapts to large file parsing requirements
`SYNC_CRON_EXPRESSION`	`0 0 2 * * ` and `0 0 1 * 0`	Spot data updates daily at midnight, and inventory data updates every Sunday. Triggering sync tasks at separate times avoids resource conflicts
`API_ALLOWED_ORIGINS`	`Corresponding enterprise internal business system domain names`	Steel trade data involves commercial sensitivity. Restricting cross-origin access sources protects data security
`TEXT_SPLITTER_CHUNK_SIZE`	`800–1200 characters`	Steel trade data has long specification descriptions. Overly long segments reduce recall accuracy, while overly short segments increase context processing overhead

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

Three Common Mistakes

Phenomenon: Calling the HTTP interface returns a 413 Request Entity Too Large error. Cause: The PARSE_FILE_MAX_SIZE configuration was not adjusted, and the size of quality inspection reports and customs documents attached to steel trade due diligence reports exceeds the default limit.
Phenomenon: After a due diligence report is generated via an API call, the list of knowledge base files linked to the call is not accessible. Cause: The API_RETURN_SOURCE_DOCS configuration was not enabled, and the default configuration does not activate the source file return function.
Phenomenon: Scheduled sync tasks frequently time out and interrupt. Cause: The API_REQUEST_TIMEOUT configuration was not adjusted, and the default timeout period is too short to cover the pulling and integration cycle of multi-source steel trade data.

How to Verify Configuration is Active

Call the test interface with a single steel trade quality inspection attachment, check that the return status code is 200 OK to confirm the file parsing configuration is active.
Submit a query request that includes specialized fields such as material_grade and delivery_location, check that the returned results include the corresponding fields to confirm the field configuration is correct.
Review scheduled sync task logs, confirm that tasks trigger at the time specified by SYNC_CRON_EXPRESSION with no timeout errors, to confirm the sync configuration is active.
Call the interface with a domain name outside the cross-origin whitelist, check that a 403 Forbidden error is returned to confirm the cross-origin restriction 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.