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AndrewStone
2020-11-04 13:23:02 -05:00
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protocol/network/messages/getdata.md
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# Request: Get Data (“getdata”)
Requests information (generally previously announced via an [inv](/protocol/network/messages/inv) message) from a peer.
As such, a getdata request carries the same general format as an inventory message and is used to request any items that the node was previously unaware.
Requests information (generally previously announced via an INV) from a peer.
A GETDATA request is a [vector](/protocol/p2p/vector.md) of INV-formatted data.
## Message Format
| Field | Length | Format | Description |
|--|--|--|--|
| inventory count | variable | [variable length integer](/protocol/formats/variable-length-integer) | The number of inventory items being requested in this message. |
| inventory items | `inventory_count` * 36 bytes | `inventory_count` [inventory items](/protocol/network/messages/inv#inventory-item-format) | The set of inventory items being requested. |
| vector length N | variable | compact int | number of items |
| item 0 type | 4 bytes | unsigned int<sup>[(LE)](/protocol/misc/endian/little)</sup> | type of the requested object |
| item 0 hash | 32 bytes | bytes | hash of the requested object |
| ... | | | |
| item N-1 type |
| item N-1 hash
### Type
The type of the desired object. See [INV](/protocol/network/messages/inv.md) for specific values
### Hash
The [hash identifier](glossary/hash__identifier) of the desired object.
## Server Implementations