---
title: HTTP I/O buffer
description: When HTTP I/O requests exceed the memory limit, caching switches to a temporary file. The following lines from boot.properties display the default values related to buffer size:
component: pingidm
version: 8.1
page_id: pingidm:setup-guide:temp-storage
canonical_url: https://docs.pingidentity.com/pingidm/8.1/setup-guide/temp-storage.html
keywords: ["Setup & Configuration", "HTTP I/O", "Requests"]
---

# HTTP I/O buffer

When HTTP I/O requests exceed the memory limit, caching switches to a temporary file. The following lines from `boot.properties` display the default values related to buffer size:

```properties
# initial size of the in-memory I/O buffer for HTTP requests
#openidm.temporarystorage.initialLength.bytes=8192

# maximum size of the in-memory I/O buffer for HTTP requests
#openidm.temporarystorage.memoryLimit.bytes=65536

# maximum size of the filesystem I/O buffer for HTTP requests, for when memoryLimit is exceeded
#openidm.temporarystorage.fileLimit.bytes=1073741824

# absolute directory path of filesystem I/O buffer for HTTP requests, and uses system property java.io.tmpdir by default
#openidm.temporarystorage.directory=/var/tmp
```

* `openidm.temporarystorage.initialLength.bytes`

  Initial size of the memory buffer in bytes.

  Default: 8192 bytes (8 KB). Maximum: The value of `openidm.temporarystorage.memoryLimit.bytes`.

* `openidm.temporarystorage.memoryLimit.bytes`

  Maximum size of the in-memory I/O buffer for HTTP requests. When the memory buffer is full, the content is transferred to a temporary file.

  Default: 65536 bytes (64 KB). Maximum: 2147483647 bytes (2 GB).

* `openidm.temporarystorage.fileLimit.bytes`

  Maximum size of the temporary storage file. If the downloaded file is larger than this value, IDM throws the exception `HTTP 413 Payload Too Large`.

  Default: 1073741824 bytes (1 GB). Maximum: 2147483647 bytes (2 GB).

* `openidm.temporarystorage.directory`

  The absolute directory path of the filesystem I/O buffer for HTTP requests.

  Default: The value of the system property `java.io.tmpdir`.