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31 lines
4.6 KiB
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:original_name: er_02_0001.html
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.. _er_02_0001:
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API Usage Guidelines
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====================
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Public cloud APIs comply with the RESTful API design principles. REST-based web services are organized into resources. Each resource is identified by one or more Uniform Resource Identifiers (URIs). An application accesses a resource based on the resource's Unified Resource Locator (URL). A URL is usually in the following format: *https://Endpoint/uri*. In the URL, **uri** indicates the resource path, that is, the API access path.
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Public cloud APIs use HTTPS as the transmission protocol. Requests/Responses are transmitted by using JSON messages, with media type represented by **application/json**.
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For details about how to use APIs, see `API Usage Guidelines <https://docs.otc.t-systems.com/en-us/api/apiug/apig-en-api-180328001.html?tag=API%20Documents>`__.
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Network instances can be attached to an enterprise router as its attachments. The attachment type varies depending on the network instance.
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.. figure:: /_static/images/en-us_image_0000001294957952.png
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:alt: **Figure 1** Attachments
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**Figure 1** Attachments
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.. table:: **Table 1** Enterprise Router attachments
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+----------------------------+-----------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+--------------------------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------+
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| Attachment Type | Network Instance | Creating an Attachment | Querying Attachment Details | Deleting an Attachment |
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+============================+===================================+==================================================================================================================================================================================================================================+====================================================================+=============================================================================================================================================+
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| VPC attachment | VPC | :ref:`Creating a VPC Attachment <createvpcattachment>` | :ref:`Querying Details About a VPC Attachment <showvpcattachment>` | :ref:`Deleting a VPC Attachment <deletevpcattachment>` |
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+----------------------------+-----------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+--------------------------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------+
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| Virtual gateway attachment | Virtual gateway of Direct Connect | Create a virtual gateway by referring to `Creating a Virtual Gateway <https://docs.otc.t-systems.com/direct-connect/api-ref/apis/virtual_gateway/creating_a_virtual_gateway.html>`__ and then attach it to an enterprise router. | :ref:`Querying Details About an Attachment <showattachment>` | `Deleting a Virtual Gateway <https://docs.otc.t-systems.com/direct-connect/api-ref/apis/virtual_gateway/deleting_a_virtual_gateway.html>`__ |
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+----------------------------+-----------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+--------------------------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------+
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