HTTP Interfaces and External Systems for Building

What this category's data looks like

Data sources include cost guidance prices released by regional housing and construction departments, internal monthly cost ledgers of project parties, and financing interest records of cooperative financial institutions. Regional guidance prices are updated monthly. Internal project ledgers are synchronized weekly. Financing costs are adjusted quarterly. The structure of a single data document includes project unique identifier, project location area, construction cost details, financing amount, accounting cycle, and revenue calculation value. For field units:

Construction cost uses yuan per square meter as the unit
Financing amount uses ten thousand yuan as the unit
Accounting cycle uses natural months as the unit
Revenue calculation value uses ten thousand yuan as the unit

Constraints on HTTP Interfaces and External Systems

The following constraints are imposed by the data characteristics:

Monthly updates to regional guidance prices require the HTTP interface to pull historical data by natural month, and return version identifiers for the corresponding cycle to avoid mixing cross-cycle data.
Weekly synchronization of internal project ledgers requires the interface to support incremental pull mode, only returning new or modified data within the update cycle to reduce transmission load.
Quarterly adjustments to financing costs require the interface to support filtering data by financing institution and financing time range.
Fields with attached units such as construction cost and financing amount require the interface to return fields with clear unit descriptions, or provide a unified metadata interface to inform recipients of field unit definitions.
Building construction project unique identifiers are mostly cross-departmental filing numbers, requiring the interface to support multi-dimensional ID queries including project filing numbers and regional project numbers.

Configuration Settings

Configuration Item	Recommended Value	Rationale
`external_api_auth_type`	`basic_auth`	External data sources related to building construction projects (such as housing and construction department interfaces, project ledger systems) mostly use Basic Auth for basic permission verification
`external_api_pull_interval`	`86400 seconds`	Project ledgers for building construction projects are synchronized weekly, and regional guidance prices are updated monthly. Pulling data daily covers full update scenarios while avoiding excessive requests
`external_api_filter_fields`	`["project_id", "area", "construction_cost", "financing_amount", "cycle", "profit_value"]`	Only retain core fields required for business operations to reduce data transmission volume
`external_api_timeout`	`30 seconds`	Building construction project data sources are mostly government or internal enterprise systems, with response delays typically in the 10-25 second range. 30 seconds covers normal request durations
`external_api_incremental_mode`	`enabled`	Building construction project data has layered update frequencies. Incremental pulling reduces interface call times and transmission load
`external_api_inherit_global_vars`	`enabled`	Supports automatically bringing global variable tokens from the workflow into the interface request header to adapt to cross-system permission verification requirements

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 testing against one’s own samples is recommended before finalizing.

Three Common Misconfigurations

Symptom: Calling the external interface returns a 401 Unauthorized status code, and building construction project yield rate data cannot be pulled. Cause: external_api_auth_type is not correctly configured as basic_auth, or valid account and password credentials meeting the data source requirements are not filled in external_api_basic_auth_credentials.
Symptom: When calling an external interface in a workflow, the token in the global variable is not correctly carried to the interface request header, and the interface returns a permission error. Cause: The external_api_inherit_global_vars configuration item is not enabled, or the global variable is not correctly mapped to the Authorization request header in the interface configuration.
Symptom: When calling the interface to query building construction project data associated with a knowledge base, an empty result set is returned. Cause: external_api_data_mapping is not configured to map the fields returned by the interface to the retrieval fields of the knowledge base, or field units do not match, resulting in failed retrieval of valid content.

How to Verify Configuration Completion

Invoke an interface testing tool, submit the configured interface address and parameters, and verify that the returned JSON data includes the preset core fields, with field units matching business requirements.
Review interface call logs to confirm that authentication credentials for each request have been correctly written to the request header, with no 401 or 403 permission errors.
Simulate a workflow trigger call, check that global variables have been correctly passed to the interface request, with no missing or incorrect parameters.
Compare the dataset returned by the interface with manually queried data source data, confirm that the pulled cycle and data content align with business requirements.

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.