Custom route in Web Api 2 to call with angular app

Question

So I have Web Api 2 set up and and doing my restful calls from Angular 5. I have a custom route that I would like to call but keep receiving a 400 error. Can someone shed a bit of light. Thanks.

Web API Side:

[Route("api/ViewAllRecords/GetApprovalRecords/{ upn }")]
public IQueryable GetViewAllRecordsForMgrApproval([FromBody]string upn)
{
 var set = db.ViewAllRecords.Where(record => record.ApproverUPN == 
 upn).AsQueryable();
 return db.ViewAllRecords;
}

Angular Side:

 GetRecordForApproval(upn) {
 return this.http.get(environment.apiUrl + '/ViewAllRecords/GetApprovalRecords', { params: {
 upn : upn
 }});
}

Answer 1

The action in question has a few issues with its definition.

[FromBody] wont work with HTTP GET requests as they do not have a BODY

//GET api/ViewAllRecords/GetApprovalRecords/upn_value_here
[HttpGet]
[Route("api/ViewAllRecords/GetApprovalRecords/{upn}")]
public IQueryable GetViewAllRecordsForMgrApproval(string upn) {
 var set = db.ViewAllRecords.Where(record => record.ApproverUPN == upn).AsQueryable();
 return db.ViewAllRecords;
}

and secondly you have the upn in the route template which defines the URL but the client side is not calling a URL that would match the template.

Update the URL called from the client

GetRecordForApproval(upn) {
 var url = environment.apiUrl + '/ViewAllRecords/GetApprovalRecords/' + upn;
 return this.http.get(url);
}