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Basic HTTP implementation

Demonstrates basic HTTP implementation using expressjs framework

Install

Clone the repo and install dependecies

npm install

Testing

npm test

Building and running the app

First build from typescript to javascript

npm run build

The compiled sources will be generated in the dist directory. Now you can execute the app by issuing the following command.

node dist/index.js

Starting the app in dev mode

npm run start:dev

Endpoints

Retrieve a list of messages

Request

GET /messages

curl http://localhost:3000/messages

Response

Status code: 200 OK

Response body:

{"messages":[]}

Post a new message

Request

POST /messages

Payload

Content-Type: application/json

{"message":"Hello, World!"}

curl -X POST http://localhost:3000/messages -H "Content-Type: application/json" -d '{"message":"Hello, World!"}'

Response

Status code: 201 Accepted

Response body:

{"message":"Message received"}

Docker

Building image

docker build -t messages-app-express .

Run container

docker run -p 3000:3000 messages-app-express

Load test

k6 run loadtest.js

Result - docker

     ✓ status was 201

     checks.........................: 100.00% ✓ 56800      ✗ 0
     data_received..................: 15 MB   128 kB/s
     data_sent......................: 9.5 MB  79 kB/s
     http_req_blocked...............: avg=31.6µs   min=0s       med=0s       max=20.26ms  p(90)=0s       p(95)=0s
     http_req_connecting............: avg=4.71µs   min=0s       med=0s       max=7.56ms   p(90)=0s       p(95)=0s
     http_req_duration..............: avg=9.03ms   min=504.1µs  med=6.91ms   max=104.36ms p(90)=19.09ms  p(95)=22.47ms
       { expected_response:true }...: avg=9.03ms   min=504.1µs  med=6.91ms   max=104.36ms p(90)=19.09ms  p(95)=22.47ms
     http_req_failed................: 0.00%   ✓ 0          ✗ 56800
     http_req_receiving.............: avg=33.97µs  min=0s       med=0s       max=2.71ms   p(90)=0s       p(95)=517.9µs
     http_req_sending...............: avg=15.15µs  min=0s       med=0s       max=7.87ms   p(90)=0s       p(95)=0s
     http_req_tls_handshaking.......: avg=0s       min=0s       med=0s       max=0s       p(90)=0s       p(95)=0s
     http_req_waiting...............: avg=8.99ms   min=503.6µs  med=6.88ms   max=104.36ms p(90)=19.04ms  p(95)=22.39ms
     http_reqs......................: 56800   472.715055/s
     iteration_duration.............: avg=211.49ms min=200.51ms med=211.44ms max=325.29ms p(90)=220.05ms p(95)=223.9ms
     iterations.....................: 56800   472.715055/s
     vus............................: 100     min=100      max=100

Results - nodemon develop

✓ status was 201

     checks.........................: 100.00% ✓ 57948      ✗ 0
     data_received..................: 16 MB   130 kB/s
     data_sent......................: 9.7 MB  81 kB/s
     http_req_blocked...............: avg=23.8µs   min=0s    med=0s       max=15.57ms  p(90)=0s       p(95)=0s
     http_req_connecting............: avg=772ns    min=0s    med=0s       max=2.51ms   p(90)=0s       p(95)=0s
     http_req_duration..............: avg=5.2ms    min=0s    med=3.19ms   max=82.52ms  p(90)=12.46ms  p(95)=15.94ms
       { expected_response:true }...: avg=5.2ms    min=0s    med=3.19ms   max=82.52ms  p(90)=12.46ms  p(95)=15.94ms
     http_req_failed................: 0.00%   ✓ 0          ✗ 57948
     http_req_receiving.............: avg=26.99µs  min=0s    med=0s       max=5.15ms   p(90)=0s       p(95)=131.3µs
     http_req_sending...............: avg=9.23µs   min=0s    med=0s       max=8.82ms   p(90)=0s       p(95)=0s
     http_req_tls_handshaking.......: avg=0s       min=0s    med=0s       max=0s       p(90)=0s       p(95)=0s
     http_req_waiting...............: avg=5.17ms   min=0s    med=3.16ms   max=82.52ms  p(90)=12.38ms  p(95)=15.87ms
     http_reqs......................: 57948   482.276302/s
     iteration_duration.............: avg=207.25ms min=200ms med=204.32ms max=297.73ms p(90)=216.45ms p(95)=218.06ms
     iterations.....................: 57948   482.276302/s
     vus............................: 100     min=100      max=100
     vus_max........................: 100     min=100      max=100

Results - local build

✓ status was 201

     checks.........................: 100.00% ✓ 58002      ✗ 0
     data_received..................: 16 MB   130 kB/s
     data_sent......................: 9.7 MB  81 kB/s
     http_req_blocked...............: avg=25.64µs  min=0s    med=0s       max=15.67ms  p(90)=0s       p(95)=0s
     http_req_connecting............: avg=709ns    min=0s    med=0s       max=2ms      p(90)=0s       p(95)=0s
     http_req_duration..............: avg=4.79ms   min=0s    med=2.88ms   max=76.93ms  p(90)=11.59ms  p(95)=14.85ms
       { expected_response:true }...: avg=4.79ms   min=0s    med=2.88ms   max=76.93ms  p(90)=11.59ms  p(95)=14.85ms
     http_req_failed................: 0.00%   ✓ 0          ✗ 58002
     http_req_receiving.............: avg=28.82µs  min=0s    med=0s       max=3.04ms   p(90)=0s       p(95)=144.49µs
     http_req_sending...............: avg=12.65µs  min=0s    med=0s       max=3.88ms   p(90)=0s       p(95)=0s
     http_req_tls_handshaking.......: avg=0s       min=0s    med=0s       max=0s       p(90)=0s       p(95)=0s
     http_req_waiting...............: avg=4.75ms   min=0s    med=2.84ms   max=76.93ms  p(90)=11.53ms  p(95)=14.79ms
     http_reqs......................: 58002   482.556205/s
     iteration_duration.............: avg=207.07ms min=200ms med=204.09ms max=295.42ms p(90)=216.29ms p(95)=217.86ms
     iterations.....................: 58002   482.556205/s
     vus............................: 100     min=100      max=100
     vus_max........................: 100     min=100      max=100