<style> .reveal p { font-size: 20px; } .reveal pre code { font-size: 0.8em; } </style> <h1>Problem, Solution, and Evaluation of WebClient Redirection</h1> --- <h3>Problem</h3> <p>In the given code snippet, a WebClient is created that redirects GET requests to another client. However, there's a problem with the current implementation: if the hostname trintel is not resolvable, the client will fail to connect and return an error.</p> --- <h4>Solution</h4> <p>To solve this problem, we can add a fallback mechanism to the client that will redirect requests to a different host if the original host is not resolvable. In the updated implementation, we create a fallback client and use it in case the original WebClient fails to connect.</p> <pre style="width: 100%; height: 510px;background-color: white;"><code style="background-color: white;color: black" class="language-java">/** * Creates a Web Client that allows to redirect Get Requests to another Client * @param webClient */ @Autowired public Controller(WebClient webClient) { WebClient fallbackClient = WebClient.create(); this.webClient = WebClient.builder() .baseUrl("http://test:8080") .filter((request, next) -&gt; next.exchange(request) .onErrorResume(e -&gt; e.getCause() instanceof UnknownHostException, e -&gt; fallbackClient.method(request.method()) .uri("http://localhost:8080" + request.url().toString().substring(19)) .headers(headers -&gt; headers.addAll(request.headers())) .body(request.body()) .exchange())) .build(); } </code></pre> --- <h4>Solution</h4> <div style="display: flex; justify-content: center; width: 200%;"> <pre style="width: 100%; height: 510px;"> <code class="language-javascript"> const images = document.querySelectorAll("img[data-src]"); const options = { rootMargin: "0px", threshold: 0.5 }; const observer = new IntersectionObserver((entries, observer) => { entries.forEach(entry => { if (entry.isIntersecting) { const img = entry.target; img.setAttribute("src", img.getAttribute("data-src")); observer.unobserve(img); } }); }, options); images.forEach(img => observer.observe(img)); </code> </pre> </div> --- <h4>Solution</h4> <p>To improve the performance of our database queries, we can add indexes to the fields that are frequently used in our queries. This will speed up the execution of these queries as the database can quickly locate the required data using the index.</p> <pre style="width: 100%; height: 510px;"><code style="background-color: white;color: black" class="language-sql">CREATE INDEX idx_users_email ON users (email); CREATE INDEX idx_orders_customer_id ON orders (customer_id); CREATE INDEX idx_products_category_id ON products (category_id);</code></pre> --- <h4>Solution</h4> <p>To make our website more accessible, we can add keyboard shortcuts for frequently used actions. This will allow users who are unable to use a mouse to navigate our website more easily.</p> <pre style="width: 100%; height: 510px;"><code style="background-color: white;color: black" class="language-javascript">// Keyboard shortcuts for frequently used actions document.addEventListener('keydown', e => { if (e.altKey && e.key === '1') { // Navigate to home page window.location.href = '/'; } else if (e.altKey && e.key === '2') { // Navigate to products page window.location.href = '/products'; } else if (e.altKey && e.key === '3') { // Navigate to cart page window.location.href = '/cart'; } });</code></pre> --- <h3>Evaluation</h3> <p>With this fallback mechanism in place, we can ensure that the client can still redirect requests even if the original host is not resolvable. However, there are still a few limitations to this solution. For example, if the fallback host is not available, the client will still fail to connect. Additionally, this solution only handles GET requests and does not redirect other types of requests.</p> <p>Overall, this solution provides a more robust and reliable way to handle GET requests with WebClient redirection, but further improvements may be necessary depending on the specific use case.</p>