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By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I have a environment composed of two relevant nodes, frontend and backend.

The docker-compose config is such that they're running on the same logical network. At first, I had suspected the issue was a docker-compose issue, and maybe some DNS mishap. However, I was able to exclude this case by manually stopping the frontend node, and manually re-attaching the same container to the network so I could run a bash shell and ping the backend host. Furthermore, I was able to fetch the same bits via curl from the backend.

So this excludes it being a Docker networking issue I think.

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The next logical culprit is something to do with CORS. The frontend request is hitting a distinct domain, e. Following the docs listed in the dev console of Firefox the claim is a "fundamental network error of some kind" occurred. For good measure, I set up Flask-CORS on the backend and verified the right headers are being relayed from the server. Yet, from the logs of the backend server - there are still no new network requests being made.

To indulge my paranoia I even broke out Wireshark. There doesn't even appear to be any relevant network requests being emitted from Firefox nor Chrome! Odds are I am over complicating this, and it's something painfully simple. But would love some pointers in the right direction. The host referred on the frontend should be localhost as the backend port is exposed on localhost via Docker. And the frontend code is running in the browser as opposed to exclusively in the container.

The container was just a process serving up those bits. The opaque network error was likely a result of referring to a domain name that didn't exist to the host network.

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Because it was part of the docker-compose virtual network. Learn more. Asked 1 year, 4 months ago. Active 1 year, 4 months ago. Viewed 2k times. On Chrome, an opaque message tells of some sort of network ish error: request. Reason: CORS request did not succeed. Active Oldest Votes. TLDR - JavaScript runs in the browser says the backend dev The host referred on the frontend should be localhost as the backend port is exposed on localhost via Docker.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

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Trying to login, facing CORS error. Could you try that? You added the cors filter to the engine-rest. I feel really stupid now. Added the CORS filter for camunda. Everything seems to be working now. Closing this.

docker cors issue

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Understanding CORS AJAX fetch problems

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I currently have a setup with two docker containers. The first container, peerAhas a private ethereum network running a single node. The second container, web-apphas a web application that uses web3. Right now, I've managed to successfully get a connection from the first container to the second but have run into some issues with RPC.

Both containers are running on a docker network "testnet", so I obtained a connection in the web-app container with web3. This gives me a web3 instance which I successfully use to get access to a smart contract deployed on the private network. The issue now is, attempting to call functions on the contract object results in the following errors Sign up to join this community.

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The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. You need to allow access from www. Learn more. Asked 1 year, 1 month ago. Active 1 year, 1 month ago.

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Viewed times. What it could be? Nikolay Mihaylov 3, 8 8 gold badges 22 22 silver badges 31 31 bronze badges. Big Hero Big Hero 1 1 1 bronze badge. Which line should be placed on? Active Oldest Votes. Mostafa Hussein Mostafa Hussein 6, 3 3 gold badges 16 16 silver badges 38 38 bronze badges. To make sure, Are you reaching the api through www.

Configure and troubleshoot the Docker daemon

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Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. Hi everyone, my problem is described here. How could i do?

I don't know where to start from.

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I use tomcat as backend container based on that official image. I have to tell that my tomcat container is based on official tomcat image.

Edit: with reference to official Tomcat documentation.

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Copy link Quote reply. This comment has been minimized. Sign in to view. I attach you my web. Can someone help me? Edit: with reference to official Tomcat documentation I've added the following section to my web. Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment.

Linked pull requests. You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window.By Rick Anderson and Kirk Larkin.

Browser security prevents a web page from making requests to a different domain than the one that served the web page. This restriction is called the same-origin policy.

The same-origin policy prevents a malicious site from reading sensitive data from another site. Sometimes, you might want to allow other sites to make cross-origin requests to your app.

View or download sample code how to download. Using the [EnableCors] attribute with a named policy provides the finest control in limiting endpoints that support CORS. CORS Middleware handles cross-origin requests. The following code applies a CORS policy to all the app's endpoints with the specified origins:. For more information, see CORS policy options in this document. The CorsPolicyBuilder methods can be chained, as shown in the following code:. Different policies can be applied to controllers, page models, or action methods with the [EnableCors] attribute.

When the [EnableCors] attribute is applied to a controller, page model, or action method, and CORS is enabled in middleware, both policies are applied. We recommend against combining policies.

Use the [EnableCors] attribute or middleware, not both in the same app. AddPolicy is called in Startup. AllowAnyOrigin is insecure because any website can make cross-origin requests to the app. Specifying AllowAnyOrigin and AllowCredentials is an insecure configuration and can result in cross-site request forgery. For more information, see the Preflight requests section. SetIsOriginAllowedToAllowWildcardSubdomains — Sets the IsOriginAllowed property of the policy to be a function that allows origins to match a configured wildcard domain when evaluating if the origin is allowed.

AllowAnyMethod :. To allow specific headers to be sent in a CORS request, called author request headerscall WithHeaders and specify the allowed headers:.

To allow all author request headerscall AllowAnyHeader :. ContentLanguage isn't listed in WithHeaders :. Therefore, the browser doesn't attempt the cross-origin request. By default, the browser doesn't expose all of the response headers to the app. The CORS specification calls these headers simple response headers. To make other headers available to the app, call WithExposedHeaders :.As a front-end developer, there are chances you ended up with this message in your console quite a few time.

This article will present a solution I used on both professional and personal developments to be able to deal with the CORS. It will also come back on other possible solutions I experimented but I was not satisfied with. The same-origin policy is a security implemented in browsers that makes sure that a web page A, served from a domain A cannot access ressources from another domain than domain A.

For more details, head to the w3c wiki. They allow a CORS compatible browser any modern browser to make cross domain requests to a compatible reverse proxy or a compatible application.

In fact, it relaxes a security feature. As you might have noticed, both ends of the channel need to be compatible: the browser on one side, the server reverse proxy or application on the other side. With the CORS mechanism, the browser automatically adds control headers to the request. Depending on the type of request it can also make a preflight request.

Purely development stuff lands near production code. There is a chance, somebody, sometimes, will activate the change in production. It implies that you have access to the code of the API. If it is a public API developped by a third party, then you cannot apply it. A common scenario is that your server is behind a reverse proxy like nginx or haproxy.

You can configure those reverse proxies for CORS. In a lot of case, you are in fact in the same conditions as with your production environment which also has a reverse proxy. The solution relies on docker. It allows to run the reverse proxy as you would any tool. You only need two files, a configuration file and a startup script. We will use nginx, but you can do the same with any reverse proxy.

The web application is served on port The back end is served on port The last section of the configuration is a special configuration I had to add so that the webpack dev server works correctly. With this script, we are telling docker to boot up a container based on a minimal official nginx image.

The configuration that nginx should use is bind mounted using the previous configuration file. The container is running on the same network stack as the host. Finally we are exposing the port Once everything is set up, you can start up your front end server, your backend server and finally your reverse proxy.

Then direct your browser to localhost and you should be able to work.

docker cors issue

Note that this method also implies that your server can bind to your IP as you are using not using localhost anymore. I did not have the opportunity to test either solution on Windows.

I hope it will help you configure your development environment. If you use any other method that you would like to share or discuss, please leave a comment!

docker cors issue

No 'Access-Control-Allow-Origin' header is present on the requested resource. What is CORS anyway? Same-origin policy The same-origin policy is a security implemented in browsers that makes sure that a web page A, served from a domain A cannot access ressources from another domain than domain A. On the Reverse Proxy Side A common scenario is that your server is behind a reverse proxy like nginx or haproxy.


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Docker cors issue
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