Support Questions
Find answers, ask questions, and share your expertise

HandleHttpRequest runs twice if requested from browser (Chrome, Firefox)

Solved Go to solution

HandleHttpRequest runs twice if requested from browser (Chrome, Firefox)

Hi,

I need to handle an HTTP request and I need to respond an HTML file with NiFi.

My flow is like

HandleHttpRequest -> ExecuteSQL -> HandleHttpResponse.

I need to query our database to show proper HTML result.

My problem is HandleHttpRequest runs twice for each request when triggered by browsers such as Chrome, Firefox. HandleHttpRequest runs once if I use Postman or SoapUI.

I've tried to eliminate the second call by using HashContent and DetectDuplicate but it makes some of our requests fail. I've investigated the issue and I've found that Chrome and Firefox creates an additional request for displaying favicon and sometimes some other reasons. (Link)


I need to find real request and I need to eliminate other requests. The real request can be the second one depending on the browser status. Browser decides when to create new requests and their orders.


So, my question is how can I run my flow exactly one time when user creates request from their browser? Because I do some operations on the database and second call ruins these operations.


Thanks.

1 ACCEPTED SOLUTION

Accepted Solutions
Highlighted

Re: HandleHttpRequest runs twice if requested from browser (Chrome, Firefox)

I've fixed it by using RouteOnAttribute to http.request.url attribute.

View solution in original post

2 REPLIES 2
Highlighted

Re: HandleHttpRequest runs twice if requested from browser (Chrome, Firefox)

I've investigated a bit more and I've found this.

"http.request.url" attribute has an "http://localhost:8011/favicon.ico" value for one of them and the other one has "http://localhost:8011".
Highlighted

Re: HandleHttpRequest runs twice if requested from browser (Chrome, Firefox)

I've fixed it by using RouteOnAttribute to http.request.url attribute.

View solution in original post

Don't have an account?