title: Azure blob trigger error :The condition specified using HTTP conditional header(s) is not met
body: <p>Im using a <strong>python azure function</strong> to get the trigger from azure blob using below code</p>
  <pre><code>import azure.functions as func
  def main(blobdata: func.InputStream):
      totalprocessingtime = time.time()
      filename=os.path.basename(blobdata.name)
      blobfilepath = str(blobdata.name).replace(str(filesystemName)+&quot;/&quot;,&quot;&quot;)
      logging.error(&quot;blobfilepath: &quot;+ blobfilepath)
  </code></pre>
  <p>When a file is uploaded in the blob got the trigger. But sometimes got below error. I didn't set and header or anything to connect the blob.(Using connection string in bindings settings). Any idea what is the reason for error?</p>
  <pre><code>Executed 'Functions.blobprocessor' (Failed, Id=91e051f4-4e19-4892-91bc-aa6921579ba8, Duration=77ms)
  Microsoft.Azure.WebJobs.Host.FunctionInvocationException: Exception while executing function: Functions.timeseries2sqlprocessor
   ---&gt; System.InvalidOperationException: Exception binding parameter 'blobdata'
   ---&gt; Microsoft.WindowsAzure.Storage.StorageException: The condition specified using HTTP conditional header(s) is not met.
     at Microsoft.WindowsAzure.Storage.Core.Executor.Executor.ExecuteAsyncInternal[T](RESTCommand`1 cmd, IRetryPolicy policy, OperationContext operationContext, CancellationToken token)
     at Microsoft.WindowsAzure.Storage.Blob.CloudBlob.DownloadRangeToStreamAsync(Stream target, Nullable`1 offset, Nullable`1 length, AccessCondition accessCondition, BlobRequestOptions options, OperationContext operationContext, IProgress`1 progressHandler, CancellationToken cancellationToken)
     at Microsoft.WindowsAzure.Storage.Blob.BlobReadStream.DispatchReadAsync(Byte[] buffer, Int32 offset, Int32 count)
     at System.IO.Stream.CopyToAsyncInternal(Stream destination, Int32 bufferSize, CancellationToken cancellationToken)
     at Microsoft.Azure.WebJobs.Host.Blobs.WatchableReadStream.CopyToAsyncCore(Task baseTask) in C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Extensions.Storage\Blobs\WatchableReadStream.cs:line 40
     at Microsoft.Azure.WebJobs.ConverterManager.&lt;&gt;c.&lt;&lt;-ctor&gt;b__4_4&gt;d.MoveNext() in C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Bindings\ConverterManager.cs:line 74
  --- End of stack trace from previous location where exception was thrown ---
     at Microsoft.Azure.WebJobs.ConverterManager.&lt;&gt;c__DisplayClass12_0`2.&lt;&lt;AddExactConverter&gt;b__0&gt;d.MoveNext() in C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Bindings\ConverterManager.cs:line 213
  --- End of stack trace from previous location where exception was thrown ---
     at Microsoft.Azure.WebJobs.ConverterManager.&lt;&gt;c__DisplayClass20_1`2.&lt;&lt;GetComposition&gt;b__0&gt;d.MoveNext() in C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Bindings\ConverterManager.cs:line 439
  --- End of stack trace from previous location where exception was thrown ---
     at Microsoft.Azure.WebJobs.IConverterManagerExtensions.&lt;&gt;c__DisplayClass1_0`2.&lt;&lt;AsTyped&gt;b__0&gt;d.MoveNext() in C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\IConverterManager.cs:line 52
  --- End of stack trace from previous location where exception was thrown ---
     at Microsoft.Azure.WebJobs.Host.Bindings.TriggerAdapterBindingProvider`2.ExactBinding`1.BindAsync(Object value, ValueBindingContext context) in C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Bindings\BindingProviders\TriggerAdapterBindingProvider.cs:line 217
     at Microsoft.Azure.WebJobs.Host.Indexers.FunctionIndexer.TriggerWrapper.BindAsync(Object value, ValueBindingContext context) in C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Indexers\FunctionIndexer.cs:line 496
     at Microsoft.Azure.WebJobs.Host.Triggers.TriggeredFunctionBinding`1.BindCoreAsync(ValueBindingContext context, Object value, IDictionary`2 parameters) in C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Triggers\TriggeredFunctionBinding.cs:line 56
  Request Information
  RequestID:4e02bac0-501e-006b-1e54-1b1ac2000000
  RequestDate:Wed, 17 Mar 2021 17:39:10 GMT
  StatusMessage:The condition specified using HTTP conditional header(s) is not met.
  ErrorCode:ConditionNotMet
  ErrorMessage:The condition specified using HTTP conditional header(s) is not met.
  RequestId:4e02bac0-501e-006b-1e54-1b1ac2000000
  Time:2021-03-17T17:39:10.6470643Z
  </code></pre>
  <p>Bindings
  <a href="https://i.stack.imgur.com/ie8hS.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ie8hS.png" alt="enter image description here" /></a></p>