What the data for this category looks like
Coal transportation and sales ledger data originates from weigh slips, coal quality test reports, rail/road waybills, and internal settlement systems. Data is generated in real time for each individual waybill. Daily summary ledgers are created each business day, and monthly operational reports are generated each month. A single ledger document includes fields such as waybill number, coal type, net calorific value on as-received basis, gross weight, tare weight, net weight, shipping origin, delivery destination, settlement unit price, settlement amount, and more. Field units include tons, large calories, yuan/ton, yuan, and other standard units. Some fields require cross-source data association across multiple systems.
What constraints these characteristics impose on HTTP interfaces and external systems
Coal transportation and sales ledger data spans multiple systems including transportation and sales, testing, and settlement. Cross-source associated data must be pulled via HTTP interfaces, which requires the interface to support multi-parameter combined queries. Individual waybill data is generated in real time. In high-frequency pull scenarios, interface call frequency must be limited to avoid rate limiting. Ledger fields include multi-dimensional physical quantities and monetary units. Interface responses must carry standardized field identifiers to prevent parsing errors. Monthly summary reports require pulling all data for the current month. The interface must support batch queries by time range, and the returned data volume must fit the transmission limit of a single call.
How to configure the settings
| Configuration Item | Recommended Approach | Rationale |
|---|---|---|
Authorization | Bearer {enterprise-specific API key} | Most coal transportation and sales systems are internally privately deployed. Authentication credentials are required to restrict external access, and this aligns with the authentication rules of FastGPT v4.17.0 |
variables | {"start_time": "2024-01-01 00:00:00", "end_time": "2024-01-31 23:59:59", "coal_type": "thermal coal"} | Aligns with time range and category filtering requirements for monthly ledger summary, covering typical coal transportation and sales business scenarios |
responseData | Return only a subset of fields including net weight, settlement amount, and shipping origin | Reduces transmitted data volume, improves ledger summary efficiency, and avoids redundant data interfering with subsequent processing |
| Interface timeout period | 300–600 seconds | Sufficient response time must be reserved for pulling multi-source data across systems, to match the network latency of coal transportation and sales systems |
| Batch query page size | Top 1000 entries | Aligns with the transmission limit of a single HTTP request, preventing request failure due to excessive data volume |
| Response field validation | Validate that weight field units are tons | Weight fields in coal transportation and sales data must use unified units to avoid unit errors in aggregated ledger data |
Three Common Mistakes
- Empty or malformed ledger summary result fields after calling the HTTP interface. Cause: The correct field extraction path was not specified via the
responseDataconfiguration, so valid data cannot be retrieved from the interface response. - Frequent rate limiting or 429 status code returns from interface calls. Cause: Interface call frequency was not limited, and high-frequency pulling of real-time waybill data exceeds the interface call limit of the coal transportation and sales system.
- Interface authentication failure, returning 401 status code. Cause: The
Authorizationconfiguration does not carry a valid API key, or the key is not authorized to access the corresponding coal transportation and sales system data.
How to Confirm the Configuration is Correct
- Call the configured HTTP interface, review the returned response content, and confirm that it includes the preset ledger fields and the field units comply with coal transportation and sales data specifications.
- Simulate a monthly ledger summary task, and check whether the interface can pull waybill data for the corresponding time range as configured in
variables. - Call the interface 10 times consecutively, confirm that authentication is normal, and there are no frequent timeouts or authentication failures. Adjust the timeout threshold based on the actual network environment.
- Extract the subset of fields configured in
responseData, and verify that the aggregated ledger data matches the field values returned in the original interface response.
The values provided here are common starting points and should be evaluated against the reader's own samples.
Question material comes from public community discussions. Configuration values are common starting points and should be measured against your own samples. Verified on 2026-09-28.