What this category's data looks like
Data related to carbon steel yield rates is primarily sourced from public APIs of domestic compliant bulk commodity spot trading platforms and daily submissions from steel industry monitoring institutions. Data updates are completed for the full day's dataset between 16:00 and 18:00 on each trading day. Updates delayed on non-trading days will be completed before the next trading day's market open. Each data entry includes fields such as product grade, origin, specification parameters, transaction average price, total transaction volume, and update time. The unit for transaction average price is yuan per ton, and the unit for total transaction volume is tons. There are no additional percentage-based statistical fields.
What constraints these characteristics impose on HTTP Interfaces and External Systems
The fixed update schedule for carbon steel data, demand for multi-specification filtering, and data source rate limiting rules impose multiple constraints on HTTP interface calls. First, most connected bulk commodity platform APIs enforce call limits per IP per minute. Reasonable request intervals must be configured to avoid triggering rate limit blocking. Second, data updates are concentrated in a fixed time window. External systems must call cached APIs during non-update periods to avoid repeated requests consuming quota. Third, the requirement for multi-specification parameter filtering means HTTP requests must carry complete product grade, origin, and specification fields. Otherwise, returned results will include full-category fuzzy data that cannot match precise requirements. Delayed data updates on non-trading days also require external systems to handle empty data return scenarios to avoid triggering exception validation.
How to set configurations
| Configuration Item | Recommended Value | Rationale |
|---|---|---|
request_timeout | 30 seconds | Typical response time for carbon steel data APIs falls between 10-20 seconds. 30 seconds covers common network fluctuations |
error_retry_max | 2 retries | For temporary request failures caused by network jitter, 2 retries can improve call success rate |
spec_filter_required | Enabled | Significant price differences exist across carbon steel specifications. Forcing specification parameters in requests returns accurately matched transaction data |
cache_ttl | 86400 seconds | Data updates once per day. Matching cache duration to the update cycle avoids calling expired data |
ssl_verify | Enabled | Most bulk commodity public APIs use valid SSL certificates. Enabling verification ensures request security |
rate_limit_per_minute | 10 calls per minute | Matches the API rate limit threshold of most bulk commodity platforms to avoid triggering call blocking |
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. It is recommended to test on your own samples before finalizing settings.
Three Common Mistakes
- Scenario: HTTP request returns
SSL certificate problem: self signed certificateerror, corresponding to curl error code 60. Cause: The target API uses an untrusted self-signed SSL certificate, and SSL verification rules have not been adjusted or trusted certificates have not been imported in the configuration. - Scenario: Calling the workflow API fails to trigger a stop output operation, returning a
404 Not Foundstatus code. Cause: The call address for the stop output API has not been correctly configured, or the workflow's interrupt permission configuration has not been enabled. - Scenario: API calls return full-category carbon steel data that does not match the specified grade, origin, or specification. Cause: The
spec_filter_requiredconfiguration has not been enabled, or the request does not carry complete specification filtering parameter fields.
How to Confirm Proper Configuration
- Call the test API to send a request with complete specification parameters, and check if returned data only includes carbon steel transaction content matching the specified conditions.
- Adjust request frequency according to the target API's rate limit threshold. After sending multiple rounds of requests consecutively, confirm that no rate limit error is triggered.
- Simulate a non-trading day scenario to send a request, and check if returned data conforms to the expected empty data or update prompt logic.
- View the SSL verification result in the request log to confirm that the configuration matches the certificate type of the target API.
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.