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I am a bit confused about WOPI host and WOPI client. Can anyone tell me exactly the meaning of above 2 terms. I want to know what exactly means WOPI host (either my web application or a WOPI server on Microsoft side) and same for WOPI client.
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The WOPI protocol is used by Office applications, such as Office for the web, to view and edit files that are stored in a cloud service. Thus, Office for the web is a WOPI client, while the cloud service that stores the files is a WOPI server, often referred to as a host.
WOPI discovery is the process where a WOPI host identifies Office for the web capabilities and how to set up Office for the web applications within a site. WOPI hosts use the discovery XML to determine how to interact with Office for the web. The WOPI host should cache the data in the discovery XML.
WOPI host = WOPI server = a web API that serves files to WOPI client
WOPI client = an application that is able to edit files served by WOPI host
The two communicate via MS-WOPI protocol that is described here.
Example implementations:
A typical scenario is that you want to enable your application to edit files in Word/Excel... In that case, you need to implement a WOPI host - an endpoint which the WOPI client (OWA) will talk to. Implementing such a host is described here. You can take a look at existing projects on GitHub - marx-yu's implementation using HttpListener, or mine using ASP.NET Core 3.1.
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