--Not OK-- space before word test
curl -X GET https://ketanpandya-eval-test.apigee.net/echo2   -H 'Content-Type: application/json;  charset=utf-8'
{
  "args": {
    "id": "john.doe test@gmail.com"
  },
  "headers": {
    "Accept": "*/*",
    "Content-Type": "application/json;  charset=utf-8",
    "Host": "httpbin.org",
    "User-Agent": "curl/7.52.1"
  },
  "origin": "35.196.248.190, 34.69.56.55, 35.196.248.190",
  "url": "https://httpbin.org/get?id=john.doe test%40gmail.com"
}

--OK---
curl -X GET https://ketanpandya-eval-test.apigee.net/echo2   -H 'Content-Type: application/json'
{
  "args": {
    "id": "john.doe+test@gmail.com"
  },
  "headers": {
    "Accept": "*/*",
    "Content-Type": "application/json",
    "Host": "httpbin.org",
    "User-Agent": "curl/7.52.1"
  },
  "origin": "35.196.248.190, 35.184.145.14, 35.196.248.190",
  "url": "https://httpbin.org/get?id=john.doe%2Btest%40gmail.com"
}


--YOUR proxy - this one is OK --
curl -X GET https://ketanpandya-eval-test.apigee.net/assignmsg-2/f1 -H 'Content-Type: application/json'
{
  "url": "/?id=john.doe%2Btest%40gmail.com",
  "method": "GET",
  "headers": {
    "host": "buoyant-climate-208500.appspot.com",
    "x-forwarded-for": "35.196.248.190,34.69.56.55, 169.254.1.1",
    "x-forwarded-proto": "https",
    "forwarded": "for=\"34.69.56.55\";proto=https",
    "x-forwarded-port": "443",
    "user-agent": "curl/7.52.1",
    "accept": "*/*",
    "content-type": "application/json",
    "x-cloud-trace-context": "0b117606eb94bc3c5d121e880ecd135d/14331603209337185582",
    "x-appengine-citylatlong": "0.000000,0.000000",
    "x-appengine-country": "US",
    "x-appengine-region": "?",
    "x-appengine-city": "?",
    "x-appengine-https": "on",
    "x-appengine-user-ip": "34.69.56.55",
    "x-appengine-request-log-id": "5dd4326500ff0b3ede408fde1500016d7e62756f79616e742d636c696d6174652d3230383530300001323031393039303374313531373231000100",
    "x-appengine-default-version-hostname": "buoyant-climate-208500.appspot.com"
  },
  "body": {}
}

--NOt OK - it has %20 - space --
curl -X GET https://ketanpandya-eval-test.apigee.net/assignmsg-2/f1 -H 'Content-Type: application/json; charset=utf-8'
{
  "url": "/?id=john.doe%20test%40gmail.com",
  "method": "GET",
  "headers": {
    "host": "buoyant-climate-208500.appspot.com",
    "x-forwarded-for": "35.196.248.190,35.226.79.19, 169.254.1.1",
    "x-forwarded-proto": "https",
    "forwarded": "for=\"35.226.79.19\";proto=https",
    "x-forwarded-port": "443",
    "user-agent": "curl/7.52.1",
    "accept": "*/*",
    "content-type": "application/json; charset=utf-8",
    "x-cloud-trace-context": "32dfb70a8122a36920518cafe74af2d4/6218813655775718608",
    "x-appengine-country": "US",
    "x-appengine-city": "?",
    "x-appengine-citylatlong": "0.000000,0.000000",
    "x-appengine-region": "?",
    "x-appengine-https": "on",
    "x-appengine-user-ip": "35.226.79.19",
    "x-appengine-request-log-id": "5dd4326600ff0279f68151286c00016d7e62756f79616e742d636c696d6174652d3230383530300001323031393039303374313531373231000100",
    "x-appengine-default-version-hostname": "buoyant-climate-208500.appspot.com"
  },
  "body": {}
}

--seems double encoding ?
curl -X GET https://ketanpandya-eval-test.apigee.net/assignmsg-2/f2 -H 'Content-Type: application/json'
{
  "url": "/?id=john.doe%26%23x2b%3Btest%26%23x40%3Bgmail.com",
  "method": "GET",
  "headers": {
    "host": "buoyant-climate-208500.appspot.com",
    "x-forwarded-for": "35.196.248.190,34.69.56.55, 169.254.1.1",
    "x-forwarded-proto": "https",
    "forwarded": "for=\"34.69.56.55\";proto=https",
    "x-forwarded-port": "443",
    "user-agent": "curl/7.52.1",
    "accept": "*/*",
    "content-type": "application/json",
    "x-cloud-trace-context": "3514412e57617783325a758d838c8b69/9931491799664154129",
    "x-appengine-country": "US",
    "x-appengine-city": "?",
    "x-appengine-citylatlong": "0.000000,0.000000",
    "x-appengine-region": "?",
    "x-appengine-https": "on",
    "x-appengine-user-ip": "34.69.56.55",
    "x-appengine-request-log-id": "5dd4356e00ff02967bd06b4dbe00016d7e62756f79616e742d636c696d6174652d3230383530300001323031393039303374313531373231000100",
    "x-appengine-default-version-hostname": "buoyant-climate-208500.appspot.com"
  },
  "body": {}
}

curl -X GET https://ketanpandya-eval-test.apigee.net/assignmsg-2/f2 -H 'Content-Type: application/json; charset=utf-8'
{
  "url": "/?id=john.doe%26%23x2b%3Btest%26%23x40%3Bgmail.com",
  "method": "GET",
  "headers": {
    "host": "buoyant-climate-208500.appspot.com",
    "x-forwarded-for": "35.196.248.190,34.69.56.55, 169.254.1.1",
    "x-forwarded-proto": "https",
    "forwarded": "for=\"34.69.56.55\";proto=https",
    "x-forwarded-port": "443",
    "user-agent": "curl/7.52.1",
    "accept": "*/*",
    "content-type": "application/json; charset=utf-8",
    "x-cloud-trace-context": "39ad4e6f643b2dfd4c80e83b8dd0200a/4750804036297287255",
    "x-appengine-citylatlong": "0.000000,0.000000",
    "x-appengine-city": "?",
    "x-appengine-region": "?",
    "x-appengine-country": "US",
    "x-appengine-https": "on",
    "x-appengine-user-ip": "34.69.56.55",
    "x-appengine-request-log-id": "5dd4359800ff097eae6315675400016d7e62756f79616e742d636c696d6174652d3230383530300001323031393039303374313531373231000100",
    "x-appengine-default-version-hostname": "buoyant-climate-208500.appspot.com"
  },
  "body": {}
}