gwang1224
commented
11 months ago 3. Main Challenge
CORS
Issue: Cors error from server to server, server to deployed, deployed to deployed
CORS error (Cross-Origin Resource Sharing error) occurs when a web page tries to request data from a different domain than the one that served the web page. To fix it, the server must include specific headers in its response, such as Access-Control-Allow-Origin, to indicate which origins are allowed to access its resources.
When running server to server, the error occurs when a web application, running at one origin (in this case, 'http://127.0.0.1:4000/'), tries to request a different origin ('http://localhost:8085/') that doesn't explicitly allow such requests.
Server to Server Fix: NGINX
This code handles CORS (Cross-Origin Resource Sharing) preflight requests. Requests are HTTP OPTIONS requests are sent by the browser to check whether a cross-origin request is allowed by the server before making the actual request.
Access-Control-Allow-Origin: Specifies which origins are allowed to access the resource. In this case, it allows any origin by using the asterisk symbol(*).
if ($request_method = OPTIONS ) { add_header "Access-Control-Allow-Headers" "access-control-allow-origin, access-control-allow-credentials, Content-Type, Authorization, x> add_header "Access-Control-Allow-Credentials" "true"; add_header "Access-Control-Allow-Origin" "*"; add_header "Access-Control-Allow-Methods" "GET, POST, PUT, DELETE, OPTIONS, HEAD"; add_header "Access-Control-Allow-MaxAge" 600; return 200; }
Server to Deployed
In our backend files, which include AllStorting.java, FibonacciController.java, I added
@CrossOrigin(origins="https://ige-csa.github.io/")
This is used by Spring application to enable Cross-Origin Resource Sharing (CORS) for a specific controller or method. The specified origin (https://ige-csa.github.io/) is allowed to make cross-origin requests to the controller or method.
Other struggles
- One large file for sorting --> multiple small files for fib, one file just for inheritance
- Calculating num swaps kept not working (bubble & insert kept appearing same, merge had to do special merge swaps, selection was fine)
- Difference in times for fibonnaci algorithms so small that doesn't show diff in milli, had to measure in nano
- Fib user input in correspondence with displayed table values
emmaxshen
1. Implementation changes
Original Ideation & Design
2A. SORTING: Key Accomplishments
ABSTRACT CLASS: Abstract base class defining the common structure for sorting algorithms
INHERITANCE: Concrete subclass inherits common behavior from abstract class while providing specific implementations for each sort method
Merge
Insertion
Bubble
Selection
Preform sorting calculations & return results as a map
- Returns speed, num of swaps/iterations/comparisons - Averaged the results for each Sort 12 times with 10,000 random elements Generated data
2B. FIBONACCI: Key Accomplishments
API Controller
- 2 additional methods to solve nth result Binet
Matrix
Generating key info (fib num & time)
