This property establishes the number of bytes a Web server will read into a buffer and pass to an ISAPI extension. This occurs once per client request. The ISAPI extension receives any additional data directly from the client. The range is 0 to &HFFFFFFFF (4GB).
| Data type | Long |
| Default value | 49152 (48 KB) |
| Inheritance | Inheritable |
This property is accessible at the following locations:
| Metabase Path | Key Type |
| /LM/W3SVC | IIsWebService |
| /LM/W3SVC/N | IIsWebServer |
| /LM/W3SVC/N/ROOT | IIsWebVirtualDir |
| /LM/W3SVC/N/ROOT/WebVirtualDir | IIsWebVirtualDir |
| /LM/W3SVC/N/ROOT/WebVirtualDir/WebDirectory | IIsWebDirectory |
| /LM/W3SVC/N/ROOT/WebVirtualDir/WebDirectory/WebFile | IIsWebFile |
The following table lists additional information required only for code that uses the IIS Admin Base Object.
| Metabase identifier | MD_UPLOAD_READAHEAD_SIZE |
| User type | IIS_MD_UT_FILE |