applied "encodeURIComponent" to "branchName"

[IKatsuba]

Solution for the problem

const projectId = 5;
const branchName = 'environment/test';

Branches.show(projectId, branchName);

StatusCodeError: 404 - {"error":"404 Not Found"}
    at new StatusCodeError (/project/node_modules/request-promise-core/lib/errors.js:32:15)
    at Request.plumbing.callback (/project/node_modules/request-promise-core/lib/plumbing.js:104:33)
    at Request.RP$callback [as _callback] (/project/node_modules/request-promise-core/lib/plumbing.js:46:31)
    at Request.self.callback (/project/node_modules/request/request.js:188:22)
    at emitTwo (events.js:126:13)
    at Request.emit (events.js:214:7)
    at Request.<anonymous> (/project/node_modules/request/request.js:1171:10)
    at emitOne (events.js:116:13)
    at Request.emit (events.js:211:7)
    at IncomingMessage.<anonymous> (/project/node_modules/request/request.js:1091:12)
    at Object.onceWrapper (events.js:313:30)
    at emitNone (events.js:111:20)
    at IncomingMessage.emit (events.js:208:7)
    at endReadableNT (_stream_readable.js:1064:12)
    at _combinedTickCallback (internal/process/next_tick.js:138:11)
    at process._tickCallback (internal/process/next_tick.js:180:9)

[jdalrymple]

Looks good!