Pagination and nextCursor in header
Hello all,
I'm using a HTTP Client snap to retrieved a few thousands of records, and I need to use pagination.
The system that I'm calling is using cursor based pagination. If the number of elements returned is higher than the limit defined, the response header will contain a "nextCursor" value that I need to use as parameter to the "cursor" key for the next call, and so on until no more "nextCursor".
This should be working fine, however I can't seem to get the content of the response header for my next call. When I use Postman I can see that there is a header returned, and the value that I need is stored under the key "X-Pagination-Next-Cursor" and not "nextCursor" as I expected.
How can I access the values of the header?
In the Snap itself, in the Pagination section, there is a "Override headers" part that I tried to configure by mapping the "cursor" key with either $nextCursor, $headers.nextCursor or $headers.X-Pagination-Next-Cursor, but nothing works, I'm only getting the records from the first page, there is no failure and no pagination.
Thanks in advance for any help!
JF
Hi JF -
Based on the documentation and your specific use case with cursor-based pagination, here's how to properly access response headers in the HTTP Client snap pagination configuration:
Accessing Response Headers in Pagination
For cursor-based pagination where the next cursor is in a response header like "X-Pagination-Next-Cursor", you need to configure the pagination settings as follows:
1. Has Next Configuration
In the Has Next field, use an expression to check if the header exists:$headers['X-Pagination-Next-Cursor'] != null
- Next URI Configuration
In theNext URIfield, construct your URL with the cursor parameter from the header:
"https://your-api-endpoint.com/api/data?cursor=" + $headers['X-Pagination-Next-Cursor']
Key Points for Header Access
- Use $headers object: Response headers are accessible through the $headers object in pagination expressions
- Exact header name: Use the exact header name as returned by the API (in your case: X-Pagination-Next-Cursor)
- Case sensitivity: Header names are case-sensitive, so ensure you match exactly what the API returns
Complete Example Configuration
For your specific scenario:
Has Next:$headers['X-Pagination-Next-Cursor'] != null && $headers['X-Pagination-Next-Cursor'] != ""
Next URI:
"https://your-base-url/endpoint?limit=1000&cursor=" + $headers['X-Pagination-Next-Cursor']
Alternative Approaches
If the above doesn't work, you can also try:- $response.headers['X-Pagination-Next-Cursor']
- Enable Debug mode in the HTTP Client snap to see all available response data structure
Override Headers Section
The "Override headers" section you mentioned is typically used to modify request headers for subsequent pagination calls, not to access response headers. For accessing response header values in pagination logic, use the $headers object in the Has Next and Next URI fields as shown above.
This approach should allow you to properly implement cursor-based pagination using the header values returned by your API. I used SnapGPT to support formulating this response for you.- Next URI Configuration
