HTTP Interfaces and External Systems for Thermal Coal Intelligent Due Diligence Reports

Thermal coal intelligent due diligence report data mainly comes from coastal port transaction monitoring, railway freight ledgers, and public data

What the data for this category looks like

Thermal coal intelligent due diligence report data mainly comes from coastal port transaction monitoring, railway freight ledgers, and public data from production site quality inspection institutions. Update frequency is daily updates, with some core transaction data refreshed hourly. Document structure includes fields such as production site name, net calorific value as received basis (calorific value), total sulfur content, ash content, tax-included ex-warehouse price, transaction location, release time, and more. Calorific value unit is kilocalories per kilogram, sulfur content unit is percentage, price unit is yuan per ton. A single due diligence report usually includes detailed data from multiple sources.

What constraints these characteristics impose on HTTP interfaces and external systems

Multi-source data integration requires configuring authentication parameters for multiple external APIs simultaneously. High-frequency update requirements demand that interfaces support more than 10 calls per minute. Fixed fields and unit requirements mean interface return validation logic must match the exclusive data format of thermal coal, to prevent invalid data from entering the system. Single report files have large sizes, so upload interface size limits must be adjusted to avoid transmission interruptions. Cross-data-source data pulling takes a long time, so interface timeout periods must be extended.

Configuration Settings

Configuration ItemRecommended SettingRationale
UPLOAD_FILE_MAX_SIZE500 MBThermal coal due diligence reports include multiple quality inspection reports and transaction ledgers, with single files usually not exceeding 500 MB
HTTP_REQUEST_TIMEOUT120 secondsPulling detailed data across multiple data sources takes a long time, to avoid timeout interruptions
PARSE_FIELD_VALIDATIONEnabledThermal coal data has fixed units and field formats. Validation is required to check whether the calorific value unit is kilocalories per kilogram and the price unit is yuan per ton
API_RATE_LIMIT10 requests per minuteMost industry public data source interface call limits are 10 times per minute. Matching this threshold avoids triggering rate limiting
FILE_ENCODINGUTF-8Most thermal coal industry data sources return documents encoded in UTF-8, compatible with most import formats
RESPONSE_STRICT_MODEEnabledStrict matching of the field list required for due diligence reports is needed, to filter irrelevant data and ensure report accuracy

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 case-by-case analysis, and it is recommended to test on relevant samples before finalizing settings.

Three Common Mistakes

  • A 413 Request Entity Too Large error is returned when uploading a due diligence report via the HTTP interface. The UPLOAD_FILE_MAX_SIZE configuration was not adjusted, and the default value is smaller than the actual file size of the thermal coal due diligence report.
  • The calorific value field is empty when passing markdown documents to the knowledge base via the API. The PARSE_FIELD_VALIDATION configuration was not enabled, and field unit verification was not performed, resulting in content that does not match the thermal coal data format being filtered out.
  • A 429 Too Many Requests error is returned when calling external data source interfaces in batches. The API_RATE_LIMIT configuration was not set, and the call frequency exceeded the interface limits of the industry data sources.

How to Confirm Proper Configuration

  • Upload a standard thermal coal due diligence report, and check that the HTTP status code returned by the interface is 200.
  • Call the external data source interface to pull test data, and verify that the returned fields include the thermal coal-exclusive production site, calorific value, and price, with units meeting requirements.
  • Call the interface a specified number of times consecutively, and confirm that the 429 Too Many Requests error is not triggered.
  • View documents imported into the knowledge base, and confirm that all required fields have been correctly extracted.

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.