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){}

I tried with the same code, I can able to get the value of name as test.csv. Did you try with the latest SDK? — Jayendran
– Jayendran, Commented Oct 10, 2018 at 15:35
Make sure the inputblob is already available in the blob container. I tried the same and I can get the stream in the inputblob . Please make sure you uploaded the test.csv inyour blob container. The Stream inputblob will be null only if you not have the corresponding blob in that container — Jayendran
– Jayendran, Commented Oct 10, 2018 at 16:14
Do you have any update on this? Did you check the spelling ? — Jayendran
– Jayendran, Commented Oct 12, 2018 at 10:25

Karthikeyan VK · Accepted Answer · 2018-10-12 10:32:22Z

1

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

edited Oct 12, 2018 at 10:32

answered Oct 12, 2018 at 10:26

Karthikeyan VK

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Jayendran · Accepted Answer · 2018-10-12 10:48:17Z

1

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

answered Oct 12, 2018 at 10:48

Jayendran

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