Getting response headers from an AJAX POST requestWould you like to know how to

I am having trouble retrieving response headers sent by the server. Despite being able to view the response headers in Chrome Dev Tools, when trying to access them using JavaScript, I am only getting an empty object.

(I am utilizing the isomorphic-fetch library for making XHR requests.)

        fetch("http://my.cors.url/postsomedata", {
            method: 'POST',
            headers: {
                Accept: 'application/json',
                'Content-Type': 'application/json',
            },
            body: JSON.stringify(myjsobject),
        })
        .then(response => response.headers)
        .then((headers) => {
            console.log(headers); // empty object
        })

This question is distinct from the topic discussed in How to get Response headers in AJAX as I am not utilizing jQuery for this task.

javascriptajaxcorsisomorphic-fetch-api

Answer №1

It turned out that the issue lied with my back-end server's CORS configuration. Since I am utilizing spring boot, I needed to set up the application in a specific way to pass custom headers into the xhr response.

@Bean
public WebMvcConfigurer corsConfigurer() {
    return new WebMvcConfigurerAdapter() {
        @Override
        public void addCorsMappings(CorsRegistry registry) {
            registry.addMapping("/**").allowedMethods("GET", "POST", "PUT", "DELETE", "OPTIONS")
                    .exposedHeaders("MyHeader");
        }
    };
}

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