Why is the local image displayed normally, but the official environment cannot be displayed?

The image path is correct, why can't the official environment be displayed?

In web development, we often encounter the problem: in the local development environment, the images can be displayed normally, but cannot be displayed after being deployed to the formal environment. This article will analyze a case in which the image path seems to be consistent in the development environment and the formal environment, but cannot be displayed in the formal environment.

Problem description: The developer uses the tag to embed pictures in the page. The pictures can be displayed normally in the development environment, but cannot be displayed in the formal environment. Through checking, it was found that the image path in the src attribute is correct and can be opened directly in the browser.

Possible solutions:

In order to find the root cause of the problem, we need further debugging information. First, it is recommended that developers open the browser's developer tools (usually opened by pressing F12) to view the console (Console) and network panels. The console panel displays JavaScript errors or warning messages, while the network panel displays resource loading, including the request status of the image (for example, 200 OK means success, 404 Not Found means resource not found).

According to experience, this may be the following reasons:

1. Cross-domain access restrictions: If the image resource is hosted under a different domain name, port, or protocol, the browser may block access due to the same-origin policy. Developers need to check the source of the image and the configuration of the server to ensure cross-domain access is allowed.
2. Image path error: Although the developer believes that the image path is correct, this may not be the case. For example, a formal environment may use a different root directory or virtual directory, resulting in errors in the calculation of the image path relative to the path. If the application is deployed in a secondary directory, the image path may need to be adjusted accordingly. Carefully check the actual path of the image in the formal environment to make sure it is consistent with the path in the src property.
3. Server configuration issues: Servers in formal environments may have some security configurations, such as whitelisting mechanisms, that prevent access to specific resources. The developer needs to check the server's configuration to ensure that access to the image resource is allowed. This may involve adjustments to server-side firewall rules or other security policies.

Through the above analysis and troubleshooting, developers should be able to find the root cause that the images cannot be displayed in the formal environment. Be sure to check the error message of the console and network panel, which will provide important clues to resolve the problem.

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