What This Category's Data Looks Like
Thermal coal research report data comes from four main sources: China Coal Industry Association, Qinhuangdao Coal Trading Market, domestic futures exchanges, and research departments of leading coal enterprises. Updates follow a regular schedule every workday. Temporary releases are added during major market fluctuations. Each research report has four core sections: core market data, supply and demand balance analysis, policy impact interpretation, and future price forecast. Core fields include: thermal coal delivery price (unit: yuan/ton), port inventory (unit: 10,000 tons), railway shipment volume (unit: 10,000 tons/day), publishing organization, and release time. Some reports include historical price comparison tables.
Constraints Imposed on HTTP Interfaces and External Systems
Thermal coal research reports have high-frequency update requirements. The interface must support no fewer than 30 calls per minute to avoid data lag caused by cache expiration. Multiple fields use dedicated units. External systems must strictly bind field and unit mapping when receiving interface return values to prevent unit conversion errors. Individual reports are relatively long. Interface segmented recall parameters must adapt to long text splitting to avoid truncated returned content or exceeding the single reception limit of external systems. Multi-source report aggregation is required. The interface must support passing filter parameters by publishing organization and release time to adapt to external system classification retrieval logic.
Configuration Settings
| Configuration Item | Recommended Value | Rationale |
|---|---|---|
maxContext | 8000–12000 characters | The average length of a single thermal coal research report covers 6000-10000 characters, this value can fully recall core information |
Recall count | Top 8–12 entries | Valid decision information for thermal coal research reports is concentrated in the first 3-5 entries, this value balances retrieval accuracy and interface load |
PARSE_FILE_TIMEOUT_SECONDS | 120 seconds | Research reports contain multiple sets of structured data tables, parsing time is longer than ordinary text documents |
API_RATE_LIMIT | 50 calls per minute | Matches the call demand of high-frequency updates for thermal coal research reports on workdays, to avoid interface current limiting errors |
chatId | Required, carry a unique session identifier | Can accurately associate the call source of external systems in platform conversation logs, to facilitate troubleshooting of concurrent exceptions |
Chunk size | 1000–1500 characters | Adapts to the paragraph structure of thermal coal research reports, avoiding damage to the integrity of data fields during splitting |
The parameter values given 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, and it is recommended to test on your own samples before finalizing.
Three Common Configuration Mistakes
- Phenomenon: The interface returns a 429 status code, indicating the call frequency exceeds the limit. Cause: The
API_RATE_LIMITparameter is not configured, or its value is lower than the actual call frequency of the external system. This triggers the platform's built-in current limiting rules. The issue can be optimized by adjusting the parameter in versions V4.9.7 and above. - Phenomenon: The external system's call identifier does not appear in the conversation log, or the specific conversation cannot be located using
chatId. Cause: ThechatIdparameter is not included in the interface request, or the parameter value does not use a unique session identifier. This causes log association to fail. - Phenomenon: Historical price table content is missing from search results for thermal coal research reports, and the number of returned results does not match expectations. Cause: The
Chunk sizeparameter is configured incorrectly, leading to improper long text splitting. The chunk index does not cover the complete report content. This issue requires manual parameter adjustment to adapt to long text chunking in versions 4.8.10 and earlier.
How to Confirm Configuration is Correct
- Initiate a test API request with the
chatIdparameter. Check the platform conversation log to confirm the identifier is correctly recorded. - Send multiple consecutive calls. Check for 429 status codes. Adjust the
API_RATE_LIMITvalue based on error results. - Retrieve a specified research report. Verify that returned content includes complete structured fields such as price and inventory. Confirm that
maxContextandChunk sizeconfigurations adapt to the report structure. - Parse a single thermal coal research report. Check that parsed chunked content is complete, with no missing fields or truncation.
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.