Blob binding in httpTrigger not working in VS2017 Azure function template

Question

I want to pass the filename of blob to the httptrigger, through get request as below.

http://localhost:7071/api/CSVDataMigrationHttpTrigger/testdata.csv

Code for the azure function

public static async Task<HttpResponseMessage> Run(
        [HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = "CSVDataMigrationHttpTrigger/{name}")]
        HttpRequest req, string name,
        [Blob("csvdata-upload/{name}", FileAccess.Read, Connection = "AzureWebJobsStorage")]
        Stream inputBlob, ILogger log)
    {}

inputBlob parameter is not resolved and it returns null.

But if i give filename as "testData.csv" as below in the Blob parameter, then inputBlob get resolved properly.

  public static async Task<HttpResponseMessage> Run(
            [HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = "CSVDataMigrationHttpTrigger/{name}")]
            HttpRequest req, string name,
            [Blob("csvdata-upload/testData.csv", FileAccess.Read, Connection = "AzureWebJobsStorage")]
            Stream inputBlob, ILogger log){}

Answer 1

I found out finally, the filename was case sensitive, when passed to blob. Hope it helps anyone who has the same issue.

Answer 2

Check whether your blob is actually uploaded in the Storage Container. The stream will be null only if the blob is Not Exist / Unable to find in the container