Forward request made to Azure function to another endpoint - api

Question

I need to forward a HttpRequest made to an Azure function (through proxies.json) to a different endpoint. The request needs to be forwarded with query strings and headers intact. I need to modify the response body before sending it back to the original caller.
Proxies.json
"Transactions.BatchImport.Settlements": {
"matchCondition": {
"methods": [ "GET" ],
"route": "/transactions/v1/getsettlementsbyid/{batchId}"
},
"backendUri": "http://localhost/api/storebox/settlements/{batchId}"
},
Psudocode of desired functionality
[FunctionName(nameof(GetStoreboxSettlements))]
public async Task<IActionResult> Run(
[HttpTrigger(AuthorizationLevel.Function, "GET", Route = "storebox/settlements/{batchId}")]
HttpRequest request, string batchId)
{
var response = ForwardRequest(request, $"www.anotherEndpoint.com/{batchId}");
response.Body = TransformBody(response.Body);
return new OkObjectResult(response);
}
Alternative solutions are welcome.

Answer 1

If anyone is interested, this is how I solved the problem:
Proxies.json
"Transactions.BatchImport.Settlements": {
"matchCondition": {
"methods": [ "GET" ],
"route": "/transactions/v1/getsettlementsbyid/{batchId}"
},
"backendUri": "http://localhost/api/v1/settlements/{batchId}"
},
Function code
[FunctionName(nameof(GetStoreboxSettlementsProxy))]
public async Task<HttpResponseMessage> Run(
[HttpTrigger(AuthorizationLevel.Function, "GET", Route = "v1/settlements/{batchId?}")]
HttpRequest request)
{
var baseUri = _environment.Get(Constants.Api.Endpoint);
var requestUri = new UriBuilder(baseUri)
{
Path = $"{request.Path}",
Query = request.QueryString.Value,
}.Uri;
var httpRequestMessage = new HttpRequestMessage();
httpRequestMessage.Headers.Authorization = AuthenticationHeaderValue.Parse(request.Headers["Authorization"]);
httpRequestMessage.RequestUri = requestUri;
HttpResponseMessage response = new HttpResponseMessage(HttpStatusCode.BadRequest);
try
{
response = await _httpClient.SendAsync(httpRequestMessage);
response.EnsureSuccessStatusCode();
var json = response.Content.ReadAsStringAsync().Result;
var storeBoxTransactionData = JsonConvert.DeserializeObject<StoreBoxTransactionData>(json);
if (storeBoxTransactionData.TotalSize > 0)
{
//Transform storebox settlement data
var transformedStoreBoxData = _processStoreBoxSettlementService.Process(storeBoxTransactionData);
response.Content = new StringContent(JsonConvert.SerializeObject(transformedStoreBoxData), Encoding.UTF8, "application/json");
return response;
}
}
catch (Exception e)
{
_logger.LogError($"Failed to get settlements {e}");
}
return response;
}