refactor: rename opt-out symbol to x-ipfs-companion-no-redirect

As suggested in
#505 (comment)

README.md

@@ -45,7 +45,7 @@ If tested path is a valid IPFS address it gets redirected and loaded from a loca
 
 It is possible to opt-out from redirect by
 a) suspending extension via global toggle
-b) including `x-ipfs-no-redirect` in the URL ([as a hash or query parameter](https://ipfs.io/ipfs/QmbWqxBEKC3P8tqsKc98xmWNzrzDtRLMiMPL8wBuTGsMnR?x-ipfs-no-redirect#x-ipfs-no-redirect)).
+b) including `x-ipfs-companion-no-redirect` in the URL ([as a hash or query parameter](https://ipfs.io/ipfs/QmbWqxBEKC3P8tqsKc98xmWNzrzDtRLMiMPL8wBuTGsMnR?x-ipfs-companion-no-redirect#x-ipfs-companion-no-redirect)).
 
 #### IPFS API as `window.ipfs`
 

add-on/src/lib/ipfs-request.js

@@ -3,7 +3,7 @@
 
 const IsIpfs = require('is-ipfs')
 const { urlAtPublicGw } = require('./ipfs-path')
-const redirectOptOutHint = 'x-ipfs-no-redirect'
+const redirectOptOutHint = 'x-ipfs-companion-no-redirect'
 
 function createRequestModifier (getState, dnsLink, ipfsPathValidator, runtime) {
   // Request modifier provides event listeners for the various stages of making an HTTP request
@@ -136,7 +136,7 @@ function redirectToGateway (requestUrl, state) {
 
 function isSafeToRedirect (request, runtime) {
   // Do not redirect if URL includes opt-out hint
-  if (request.url.includes('x-ipfs-no-redirect')) {
+  if (request.url.includes('x-ipfs-companion-no-redirect')) {
     return false
   }
 

test/functional/lib/ipfs-request.test.js

@@ -79,17 +79,17 @@ describe('modifyRequest.onBeforeRequest', function () {
         })
         it(`should be left untouched if URL includes opt-out hint (${nodeType} node)`, function () {
           // A safe way for preloading data at arbitrary gateways - it should arrive at original destination
-          const request = url2request('https://google.com/ipfs/QmbWqxBEKC3P8tqsKc98xmWNzrzDtRLMiMPL8wBuTGsMnR?x-ipfs-no-redirect#hashTest')
+          const request = url2request('https://google.com/ipfs/QmbWqxBEKC3P8tqsKc98xmWNzrzDtRLMiMPL8wBuTGsMnR?x-ipfs-companion-no-redirect#hashTest')
           expect(modifyRequest.onBeforeRequest(request)).to.equal(undefined)
-          expect(redirectOptOutHint).to.equal('x-ipfs-no-redirect')
+          expect(redirectOptOutHint).to.equal('x-ipfs-companion-no-redirect')
         })
         it(`should be left untouched if CID is invalid (${nodeType} node)`, function () {
           const request = url2request('https://google.com/ipfs/notacid?argTest#hashTest')
           expect(modifyRequest.onBeforeRequest(request)).to.equal(undefined)
         })
         it(`should be left untouched if its is a HEAD preload with explicit opt-out in URL hash (${nodeType} node)`, function () {
           // HTTP HEAD is a popular way for preloading data at arbitrary gateways, so we have a dedicated test to make sure it works as expected
-          const headRequest = {url: 'https://google.com/ipfs/QmbWqxBEKC3P8tqsKc98xmWNzrzDtRLMiMPL8wBuTGsMnR?argTest#x-ipfs-no-redirect', method: 'HEAD'}
+          const headRequest = {url: 'https://google.com/ipfs/QmbWqxBEKC3P8tqsKc98xmWNzrzDtRLMiMPL8wBuTGsMnR?argTest#x-ipfs-companion-no-redirect', method: 'HEAD'}
           expect(modifyRequest.onBeforeRequest(headRequest)).to.equal(undefined)
         })
       })