What the data for this category looks like
The data for railway and highway intelligent due diligence reports primarily comes from public road network monitoring data released by transportation authorities, project completion archives, and daily operation and maintenance logs. There are two update frequency categories: real-time road network traffic data is updated minute-by-minute, while project completion and compliance-related archives are updated quarterly or once upon project completion archiving. The document structure includes four core modules: basic line parameters, operation statistics, compliance documents, and maintenance records. Fields have clear units, such as design speed in km/h, average daily traffic volume in vehicles per day, maintenance cycle in months. No redundant or ambiguous fields are included.
Constraints Imposed on HTTP Interfaces and External Systems
Real-time road network data’s minute-by-minute update requirement means HTTP interfaces must support low-latency, high-frequency calls. The volume of data returned per request must be controlled within a reasonable range to avoid bandwidth overload. Large-volume completion archive files require interfaces to support chunked uploads or have sufficient timeout and file size thresholds configured. The requirement for fields to have clear units means interface returned field names must align strictly with preset mappings to avoid unit conversion errors during subsequent parsing. The need to connect multiple data sources such as monitoring platforms and supervision systems requires external system configurations to support unified authentication and key management mechanisms, and adapt to access standards of different data sources.
Configuration Settings
| Configuration Item | Recommended Setting | Rationale |
|---|---|---|
UPLOAD_FILE_MAX_SIZE | 2000 MB | Railway and highway due diligence reports often include large files such as completion drawings and monitoring reports, and the volume of a single file usually does not exceed 2000 MB |
HTTP_REQUEST_TIMEOUT | 120 seconds | Most external transportation data source interfaces have response times in the 60-100 second range. Reserving sufficient timeout time prevents request interruptions |
API_AUTH_TYPE | Bearer Token | Domestic transportation supervision public interfaces generally adopt the Bearer Token authentication standard, which aligns with general API authentication specifications |
PARSE_FIELD_MAPPING | Map by official field names | Railway and highway data fields such as daily_traffic_volume must strictly match the fields returned by external interfaces to avoid parsing failures caused by field misalignment |
API_KEY_STORAGE_MODE | Environment variable storage | Avoid hardcoding authentication keys into configuration files or interfaces, which improves key management security |
ASYNC_SYNC_SWITCH | Configure based on data type | Real-time traffic data uses synchronous calls, while historical archive data uses asynchronous callbacks, adapting to the update rhythms of different data types |
The parameter values provided on this page are all conventional recommendations used as starting points for configuration. Actual values are affected by material form, data volume, and business rules. Specific issues require case-by-case analysis. It is recommended to test on your own samples before finalizing settings.
Three Common Misconfigurations
- Phenomenon: The interface returns a 401 Unauthorized error, or parsed data fields are empty. Cause: A universal API key is directly entered into the
ACCESS_TOKENconfiguration item, and the dedicated authentication key for the corresponding data source is not used. - Phenomenon: Large file upload fails, or parsed data is incomplete. Cause: The
UPLOAD_FILE_MAX_SIZEandHTTP_REQUEST_TIMEOUTconfigurations are not adjusted, and requests are truncated because they exceed default thresholds. - Phenomenon: Authentication conflicts occur when connecting multiple data sources, and data cannot be pulled normally. Cause: The
API_KEY_STORAGE_MODEis not set to environment variable storage, and multiple sets of keys are mixed, leading to matching errors during calls.
How to Verify Configurations Are Correct
- Upload a PDF or drawing file of a railway or highway project completion archive, confirm that the upload progress completes normally without errors, and verify that the
UPLOAD_FILE_MAX_SIZEconfiguration takes effect. - Call a test road network monitoring interface, compare the returned fields with the preset
PARSE_FIELD_MAPPINGrules, and confirm that field names and formats are fully aligned. - Trigger a synchronous call for real-time traffic volume data, check that the interface response time is within the threshold set by the
HTTP_REQUEST_TIMEOUTconfiguration, and verify that the timeout configuration is reasonable. - Check system environment variables and configuration files, confirm that authentication keys are not exposed in plain text, and verify that the
API_KEY_STORAGE_MODEconfiguration is correct.
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.