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articles/healthcare-apis/dicom/dicom-proxy-url-support.md

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Using URL manipulation allows you to customize the URL of the image location that is in the response object.
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For the following API operations the DICOM service returns the fully qualified URL of the image location in the response object under a DICOM tag (UR) in the response object.
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1. Retrieve Instance
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2. Retrieve WorkItems
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3. Retrieve OperationStatus
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4. Resolve QueryTag
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5. Resolve QueryTagError
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- Retrieve Instance
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- Retrieve WorkItems
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- Retrieve OperationStatus
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- Resolve QueryTag
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- Resolve QueryTagError
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Here's an example of a fully qualified image location URL. The URL could be found in the standard response for a STOW operation for a DICOM service that has data partition enabled, with partition name "foo".
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`https://localhost:63838/v2/partitions/foo/studies/1.2.826.0.1.3680043.8.498.13230779778012324449356534479549187420/series/1.2.826.0.1.3680043.8.498.77033797676425927098669402985243398207/instances/1.2.826.0.1.3680043.8.498.13273713909719068980354078852867170114`
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The preceding URL consists of three parts:
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1. hostname -> `https://localhost:63838` (the hostname of DICOM service)
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2. path -> `v2/partitions/foo` (the path that represents the version of DICOM service being used and the datapartition name, if enabled)
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3. The DICOM web standard path -> `studies/1.2.826.0.1.3680043.8.498.13230779778012324449356534479549187420/series/1.2.826.0.1.3680043.8.498.77033797676425927098669402985243398207/instances/1.2.826.0.1.3680043.8.498.13273713909719068980354078852867170114`
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- hostname -> `https://localhost:63838` (the hostname of DICOM service)
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- path -> `v2/partitions/foo` (the path that represents the version of DICOM service being used and the datapartition name, if enabled)
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- The DICOM web standard path -> `studies/1.2.826.0.1.3680043.8.498.13230779778012324449356534479549187420/series/1.2.826.0.1.3680043.8.498.77033797676425927098669402985243398207/instances/1.2.826.0.1.3680043.8.498.13273713909719068980354078852867170114`
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This feature allows you to customize the path of the image URL, if directed by the client, based on the request headers provided.
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## How it works
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The modified URL is based on following two headers.
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1. X-Forwarded-Host: The domain name of the original host (the one the client requested before the proxy or load balancer handled the request). For example: `X-Forwarded-Host: www.example.com`
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- X-Forwarded-Host: The domain name of the original host (the one the client requested before the proxy or load balancer handled the request). For example: `X-Forwarded-Host: www.example.com`
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2. X-Forwarded-Prefix: the original URL path or prefix that was part of the client’s request before the proxy forwarded or changed the request. For example: `X-Forwarded-Prefix: /prefix`
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- X-Forwarded-Prefix: the original URL path or prefix that was part of the client’s request before the proxy forwarded or changed the request. For example: `X-Forwarded-Prefix: /prefix`
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These headers are a part of .NET core standard forwarded headers.
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## List of services that can use forwarded headers for URL manipulation
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1. Store(STOW-RS): Upload DICOM objects to the server.
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2. Retrieve(WADO-RS): Download DICOM objects from the server.
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3. Worklist Service (UPS Push and Pull SOPs): Manage and track medical imaging workflows.
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4. Extended query tags: Define custom tags for querying DICOM data.
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3. Operation Status
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- Store(STOW-RS): Upload DICOM objects to the server.
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- Retrieve(WADO-RS): Download DICOM objects from the server.
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- Worklist Service (UPS Push and Pull SOPs): Manage and track medical imaging workflows.
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- Extended query tags: Define custom tags for querying DICOM data.
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- Operation Status
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Here are the details of a request header for a STOW operation with the forwarded headers:
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* Path: ../studies/{study}
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## Things to remember
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1. Forwarded headers don't have to be used together. If there's a need to, replace hostname and not path. Only the forwarded host header can be used. Similarly, if there's a need to replace the path, only the forwarded prefix header can be used.
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2. The client is responsible for mapping the hostname and path provided in forwarded headers to the correct DICOM service hostname and pathbase.
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- Forwarded headers don't have to be used together. If there's a need to, replace hostname and not path. Only the forwarded host header can be used. Similarly, if there's a need to replace the path, only the forwarded prefix header can be used.
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- The client is responsible for mapping the hostname and path provided in forwarded headers to the correct DICOM service hostname and pathbase.
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[!INCLUDE [DICOM trademark statement](../includes/healthcare-APIs-DICOM-trademark.md)]

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