---
type: docs
title: "How-To: Handle large http header size"
linkTitle: "HTTP header size"
weight: 6000
description: "Configure a larger http read buffer size"
---

Dapr has a default limit of 4KB for the http header read buffer size.  When sending http headers that are bigger than the default 4KB, you can increase this value. Otherwise, you may encounter a `Too big request header` service invocation error. You can change the http header size by using the `dapr.io/http-read-buffer-size` annotation or `--dapr-http-read-buffer-size` flag when using the CLI.



{{< tabs Self-hosted Kubernetes >}}

{{% codetab %}}

When running in self hosted mode, use the `--dapr-http-read-buffer-size` flag to configure Dapr to use non-default http header size:

```bash
dapr run --dapr-http-read-buffer-size 16 node app.js
```
This tells Dapr to set maximum read buffer size to `16` KB.

{{% /codetab %}}


{{% codetab %}}

On Kubernetes, set the following annotations in your deployment YAML:
```yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: myapp
  namespace: default
  labels:
    app: myapp
spec:
  replicas: 1
  selector:
    matchLabels:
      app: myapp
  template:
    metadata:
      labels:
        app: myapp
      annotations:
        dapr.io/enabled: "true"
        dapr.io/app-id: "myapp"
        dapr.io/app-port: "8000"
        dapr.io/http-read-buffer-size: "16"
...
```

{{% /codetab %}}

{{< /tabs >}}

## Related links
- [Dapr Kubernetes pod annotations spec]({{< ref arguments-annotations-overview.md >}})