RavenDB Client in Blazor Webassembly (no hosted)

[Alejandro Estepa S.]

Hello,

I have tried an example of blazor wasm (NO HOSTED only WebAssembly) by making a REST API call to GET a document (I have achieved it by installing a plugin called "Allow CORS" in chrome that is in charge of adding the corresponding headers to the response, I have looked for the configuration option of "Raven / AccessControlAllowMethods" but I can't find it for the latest version of raven 4.2, I work in linux and there is no documentation to do it.) 

Now I see that ravendb client is .netstandard 2.1 and I have tried to GET a document in my project webassembly again, but it gives me an error when creating the requestexecutor in opensession. Is there a way to pass the httpclient instance of the dependency injection? I think that it would be great to be able to create a complete only WebAssembly application with access to the database.

Thanks in advance.

[Oren Eini (Ayende Rahien)]

I'm not sure what you are trying to do.

CORS setup is here:

https://github.com/ravendb/ravendb/blob/v4.2/src/Raven.Server/Web/RequestHandler.cs#L621 

We don't provide a way to create the HttpClient externally, but I'm not sure what it is that you are trying to do 

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[Alejandro Estepa S.]

Hi Oren Eini,

I am trying to create a webassembly application written in c # using blazor. My idea is to create a complete application, without a backend. I really like ravendb and since it has an api rest I want to work with it (similar to https://blog.jeremylikness.com/blog/ef-core-and-cosmosdb-with-blazor-webassembly/). The first thing I did was a simple rest call "response = await Http.GetStringAsync (" http: // localhost: 8080 / databases / Northwind / docs ")", but this gave me a CORS error in the browser. I looked at the link to the source code you included in your answer, but I still don't understand how it is configured: is there a key in settings.json for this? Could you give me an example? My ravendb server runs on docker. As I mentioned in my first post, I fixed this using a browser plugin that injects the response with the necessary values ​​for CORS, and this worked. Afterwards, I have used ravendb client nuget, but when running inside the browser in a sandbox, we have restrictions, such as accessing the "httpcliendhan¡dler.ClientCertificates" property which is not supported in webassembly. Do you think I could get ravendb client working in webassembly? Could you give me an example?

Thanks in advance.

El domingo, 7 de junio de 2020, 13:14:14 (UTC+2), Oren Eini escribió:

I'm not sure what you are trying to do.

CORS setup is here:

https://github.com/ravendb/ravendb/blob/v4.2/src/Raven.Server/Web/RequestHandler.cs#L621 

We don't provide a way to create the HttpClient externally, but I'm not sure what it is that you are trying to do 

On Thu, Jun 4, 2020 at 10:46 PM Alejandro Estepa S. <aes...@gmail.com> wrote:

Hello,

I have tried an example of blazor wasm (NO HOSTED only WebAssembly) by making a REST API call to GET a document (I have achieved it by installing a plugin called "Allow CORS" in chrome that is in charge of adding the corresponding headers to the response, I have looked for the configuration option of "Raven / AccessControlAllowMethods" but I can't find it for the latest version of raven 4.2, I work in linux and there is no documentation to do it.) 

Now I see that ravendb client is .netstandard 2.1 and I have tried to GET a document in my project webassembly again, but it gives me an error when creating the requestexecutor in opensession. Is there a way to pass the httpclient instance of the dependency injection? I think that it would be great to be able to create a complete only WebAssembly application with access to the database.

Thanks in advance.

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[Oren Eini (Ayende Rahien)]

There should be no configuration. It should just work.

Can you show the actual interactions from Blazor to RavenDB? It should indicate the CORS initial requests.

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[Kamran Ayub]

If you have a sample that would be awesome to see.

For localhost requests, the browser won't automatically add CORS headers. When you are using fetch, you can add "mode: 'cors'" to the options explictly, see MDN. For Blazor/C#, I am not sure how to do this but there's probably a way...

[Kamran Ayub]

On Sunday, June 28, 2020 at 8:49:34 PM UTC-5, Kamran Ayub wrote:

If you have a sample that would be awesome to see.

For localhost requests, the browser won't automatically add CORS headers. When you are using fetch, you can add "mode: 'cors'" to the options explictly, see MDN. For Blazor/C#, I am not sure how to do this but there's probably a way...

You could test this theory locally, by using making a hosts entry to use a fake DNS name, then trying to do it. The browser should consider it a cross-origin request and use CORS.