Trying with other proxy the result is OK.

Is this proxy also running on localhost?

Yes, the proxy is on localhost (127.0.0.1:8123).

This is the Chrome console output:

Not CORS Anywhere, the other proxy that is working according to you. I am asking in order to determine whether the issue is specific to CORS Anywhere, or specific to your local setup (e.g. your IP is blocked by that other site, or your firewall has blocked outbound connections).

Oh, sorry !. No, the other proxy isn't on localhost. But CORS Anywhere is working ok in other request in the same app. the error occurs only in that request.

This is a right request made by the same app throught CORS anywhere running at localhost

When you use another program to send the request to the destination, with the same request headers (e.g. curl), does the request succeed?

More info:

`curl -v "127.0.0.1:8123/http://www.cartociudad.es/services/api/route?orig=43.1514858477619,-4.0472363927932&dest=40.44184877149766,-3.5748567877248845&locale=es&vehicle=WALK"
STATE: INIT => CONNECT handle 0x20081ad8; line 1407 (connection #-5000)
Added connection 0. The cache now contains 1 members
Trying 127.0.0.1...
TCP_NODELAY set
STATE: CONNECT => WAITCONNECT handle 0x20081ad8; line 1460 (connection #0)
Connected to 127.0.0.1 (127.0.0.1) port 8123 (#0)
STATE: WAITCONNECT => SENDPROTOCONNECT handle 0x20081ad8; line 1567 (connection #0)
Marked for [keep alive]: HTTP default
STATE: SENDPROTOCONNECT => DO handle 0x20081ad8; line 1585 (connection #0)
GET /http://www.cartociudad.es/services/api/route?orig=43.1514858477619,-4.0472363927932&dest=40.44184877149766,-3.5748567877248845&locale=es&vehicle=WALK HTTP/1.1
Host: 127.0.0.1:8123
User-Agent: curl/7.51.0
Accept: /

STATE: DO => DO_DONE handle 0x20081ad8; line 1664 (connection #0)
STATE: DO_DONE => WAITPERFORM handle 0x20081ad8; line 1791 (connection #0)
STATE: WAITPERFORM => PERFORM handle 0x20081ad8; line 1801 (connection #0)
HTTP 1.1 or later with persistent connection, pipelining supported
HTTP/1.1 200 OK
x-request-url: http://www.cartociudad.es/services/api/route?orig=43.1514858477619,-4.0472363927932&dest=40.44184877149766,-3.5748567877248845&locale=es&vehicle=WALK
Server Apache-Coyote/1.1 is not blacklisted
server: Apache-Coyote/1.1
content-type: application/json
transfer-encoding: chunked
date: Thu, 09 Nov 2017 09:35:47 GMT
Marked for [closure]: Connection: close used
connection: close
x-final-url: http://www.cartociudad.es/services/api/route?orig=43.1514858477619,-4.0472363927932&dest=40.44184877149766,-3.5748567877248845&locale=es&vehicle=WALK
access-control-allow-origin: *
access-control-expose-headers: server,content-type,transfer-encoding,date,connection,x-final-url,access-control-allow-origin

bbox":["-4.153689089872445","40.44187308607131","-3.5741682031937287","43.152457508872246"],"distance":"353022.13238046836","found":"true","from":"43.1514858477619,-4.0472363927932","geom":"yekfGpcuWRm@f@qATo@Ja@n@gAPaACcBn@MfCu@VKRUb@_
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Hi i think i found the problem:

I'm loading the app on localhost and the proxy on 127.0.0.1, in this case fails the request

if load the app over 127.0.0.1 the request works !!

More info: Changing my configuration to use localhost in request and proxy.js to run CORS Anywhere on localhost (not 127.0.0.1 ) didn´t work:

Is localhost resolving to 127.0.0.1 ?

Curl works right:

Can you use exactly the same curl command as the browser (in the devtools you can right-click on a request row and click to copy as a curl command). Then repeatedly issue the request and remove headers at each step until you found which request header results in a difference of how a request is handled.