DICOM PS3.18 2020b - Web Services

8.10.4 Open Notification Connection Transaction (Current)
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### 8.10.4 Open Notification Connection Transaction

This transaction creates a connection between the user agent and the origin server over which the origin server can send Event Reports to the user agent.

### Note

An origin server might play the role of a user agent when communicating with another origin-server.

The connection uses the WebSocket protocol. The connection can use the same TCP port as the HTTP connection, but they are separate connections.

See [RFC6455] for details of the WebSocket protocol.

#### 8.10.4.1 Request

There is more than one way to establish a WebSocket connection. An origin server that conforms to [RFC6455] will at least support requests to open a WebSocket over an HTTP connection that have the following syntax:

    GET SP / SP version CRLF

    Host: host CRLF

    Upgrade: "WebSocket" CRLF

    Connection: "Upgrade" CRLF

    Origin: url CRLF

    Sec-WebSocket-Key: nonce CRLF

    Sec-WebSocket-Protocol: protocols CRLF

    Sec-WebSocket-Version: "13" CRLF

    *(<header-field> CRLF)

    CRLF

The origin server may support other methods of opening a WebSocket connection, which should be included in the Conformance Statement and the Retrieve Capabilities response.

##### 8.10.4.1.1 Target Resources

The Target Resource is an origin server implementing a DICOM RESTful Service.

##### 8.10.4.1.2 Query Parameters

This transaction has no query parameters.

##### 8.10.4.1.3 Request Header Fields

Table 8.10.4-1 shows the Request Header Field usage for opening a WebSocket connection over http/https.

Table 8.10.4-1. Request Header Fields

Name | Value | Usage
--- | --- | ---
Content-Type | media-type | M
Upgrade | "WebSocket" | M
Connection | "Upgrade" | M
Origin | url | M
Sec-WebSocket-Key | accept-key | M
Sec-WebSocket-Protocol | protocols | O
Sec-WebSocket-Version | version | M

For details of the request header field values and other methods of opening a WebSocket connection see [RFC6455].

##### 8.10.4.1.4 Request Payload

The request has no payload.

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8.10.3 Transaction Overview | Home | 8.10.4.2 Behavior

DICOM PS3.18 2020b - Web Services