Cons of Using HTTP Headers

Missing Important Security Headers: Using the HTTP Headers plugin may lead to some important security headers being missed out. That leaves the website vulnerable to various cyber attacks which can lead to serious damages. No matter how well the HTTP Headers plugin is written, it is impossible to detect and add every header, so some important ones might be left out unintentionally and catastrophically.

Compatibility Issues: Adding additional HTTP headers to the WordPress website can lead to some compatibility issues with browsers or even some third-party services. For instance, some headers may not be recognized by some browsers or third-parties, which can lead to some unexpected behavior. The compatibility check must be done after using this plugin, making sure that all the additional headers declared by the plugin are correctly recognized and executed by the target browsers and services.

Adding too Many Headers: Although HTTP Headers plugin is very useful, there is a risk that too many headers can be added in the response. This may lead to an increased processing time of the requests, because the process of searching for the right header can last longer. This, in turn, might lead to slower response times, potentially making the website slower to load.

Reducing Website Performance: While HTTP Headers plugin should not reduce noticeably the website performance, there are some cases where the additional headers added by the plugin can slow down the website loading time. This is because the additional headers can add to the website's page size, meaning that the client browser has to download more data when requesting the page, potentially reducing the website performance.

Rise of False Positive Errors: Using the HTTP Headers plugin can sometimes result in false positive errors, especially when using the plugin to verify its operation. If the headers are declared incorrectly or if there is some kind of conflict in the response, the verification process can raise false errors even when everything is correct and functioning. That means the plugin's user must be very careful when using the plugin and checking for any errors.