What the data for this category looks like
The data for residential development intelligent due diligence reports comes primarily from public data sources including land transfer announcements from natural resources departments, construction permit filings from housing and urban-rural development departments, and qualification announcements of project development entities. Data update frequencies vary by type: land transfer information is updated monthly, construction permits are updated in real time alongside project progress, and qualification information is updated quarterly.
The document structure includes modules such as basic project information, development entity qualifications, planning indicators, funding sources, surrounding supporting facilities, and risk reminders. Fields include parcel number, land area (square meters), floor area ratio, investment amount (ten thousand yuan), construction period (months), and others. Fields and units have clear compliance requirements.
What constraints these characteristics impose on HTTP interfaces and external systems
Interfaces and authentication methods for multi-source public data sources differ. Support for multi-interface adaptation and dynamic switching is required. Update frequencies vary across different data sources, so support for configuring scheduled pull cycles based on data source type is needed.
Document fields and units have clear compliance requirements. Interface request parameters must strictly match field names and unit formats to avoid mapping errors. A single report contains multi-page structured files and attachments. Interfaces must support large file chunked upload and pagination pull to prevent request timeouts or content truncation.
How to configure the settings
| Configuration Item | Recommended Setting | Rationale |
|---|---|---|
PARSE_FILE_TIMEOUT_SECONDS | 600 seconds | Residential development due diligence reports contain multi-page planning and filing documents, which take a long time to parse. 600 seconds covers the complete parsing process |
RECALL_TOP_K | Top 10-15 entries | Due diligence reports need to cover multi-dimensional data including land, funding, and qualifications. An overly large recall volume increases interface latency, while an overly small volume misses critical information |
API_REQUEST_TIMEOUT | 300 seconds | Some official data source interfaces respond slowly. 300 seconds prevents timeout for routine pull tasks |
UPLOAD_FILE_MAX_SIZE | 2000 MB | Attachments for single residential development due diligence reports (such as planning drawings, qualification scan copies) are usually large, so large file upload support is required |
SCHEDULED_SYNC_INTERVAL | Configured based on data source type | Land transfer data is updated monthly, construction permits are updated alongside project progress, so the interval must match the actual update rhythm of each data source |
FIELD_MAPPING_STRICTNESS | Strict mode | Residential development due diligence report fields have clear compliance requirements. Strict mode avoids interface call errors caused by field mapping mistakes |
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 individual analysis. It is recommended to test on your own samples before finalizing settings.
Three common configuration mistakes
- A
413 Request Entity Too Largestatus code is returned when calling an interface. This occurs because theUPLOAD_FILE_MAX_SIZEconfiguration was not adjusted to accommodate the large attachment size of residential development due diligence reports. - An interface call times out, returning a
504 Gateway Timeoutstatus code. This occurs becausePARSE_FILE_TIMEOUT_SECONDSis set too short, failing to cover the parsing and pull time required for multi-page due diligence documents. - Fields returned by the interface are empty or use incorrect units. This occurs because strict mode for
FIELD_MAPPING_STRICTNESSis not enabled, leading to mismatches between units from official data sources (such as square meters being incorrectly converted to hectares) and system requirements.
How to confirm the configuration is complete
- Upload a standard residential development due diligence report, and verify that parsed fields include required items such as parcel number, planned floor area ratio, and development entity qualification, and that units meet preset requirements.
- Initiate a manual interface call, and confirm that the returned result has a
200 OKstatus code and complete, non-missing return fields. - Configure a scheduled synchronization task, wait for one synchronization cycle, and check whether the latest residential development project data has been successfully pulled to the external system.
- Simulate a field request with non-standard units, and confirm that the interface returns clear error prompts, rather than no response or chaotic formatting.
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.