Accessing localhost port from Android emulator

Question

I m running a web service on my local machine that runs at localhost 54722   I want to call the service from an app running in the Android emulator   I read that using 10 0 2 2 in the app would access localhost  but it doesn t seem to work with the port number as well  It says HttpResponseException  Bad Request

User · Answer

You can access your host machine with the IP address "10.0.2.2".

This has been designed in this way by the Android team. So your webserver can perfectly run at localhost and from your Android app you can access it via "http://10.0.2.2:<hostport>".

If your emulator must access the internet through a proxy server, you can configure a custom HTTP proxy from the emulator's Extended controls screen. With the emulator open, click More , and then click Settings and Proxy. From here, you can define your own HTTP proxy settings.

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Use 10 0 2 2 for default AVD and 10 0 3 2 for Genymotion

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For Laravel Homestead Users  If anyone using Laravel with homestead you can access app backend using 192 168 10 10 in emulator  Still not working  Another good solution is to use ngrok https   ngrok com

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I am using Windows 10 as my development platform  accessing 10 0 2 2 port in my emulator is not working as expected  and the same result for other solutions in this question as well   After several hours of digging  I found that if you add -writable-system argument to the emulator startup command  things will just work   You have to start an emulator via command line like below    emulator exe -avd  lt emulator name gt  -writable-system   Then in your emulator  you can access your API service running on host machine  using LAN IP address and binding port   http   192 168 1 2  lt port gt    Hope this helps you out   About start emulator from command line  https   developer android com studio run emulator-commandline

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I m not sure this solution will work for every Android Emulator and every Android SDK version out there but running the following did the trick for me  adb reverse tcp 54722 tcp 54722  You ll need to have your emulator up an running and then you ll be able to hit localhost 54722 inside the running emulator device successfully

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The problem is that the Android emulator maps 10 0 2 2 to 127 0 0 1  not to localhost  So configure your web server to serveron 127 0 0 1 54722 and not localhost 54722  That should do it

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Bad request generally means the format of the data you are sending is incorrect  May be mismatched data mapping   If you are getting bad request implies you are able to connect to the server  but the request is not being sent properly

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I would like to show you the way I access IISExpress Web APIs from my Android Emulator  I m using Visual Studio 2015  And I call the Android Emulator from Android Studio   All of what I need to do is adding the following line to the binding configuration in my applicationhost config file   lt binding protocol  http  bindingInformation     lt your-port gt      gt    Then I check and use the IP4 Address to access my API from Android emulator  Requirement  you must run Visual Studio as Administrator  This post gives a perfect way to do this   For more details  please visit my post on github  Hope this helps

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I faced the same issue on Visual Studio executing an web app on IIS Express  to fix it you need to go to your project properties then click on Debug Tab and change http   localhost  YOUR PORT  to http   127 0 0 1  YOUR PORT  and set the android url to http   10 0 2 2  YOUR PORT   it worked for me

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If anybody is still looking for this  this is how it worked for me   You need to find the IP of your machine with respect to the device emulator you are connected  For Emulators on of the way is by following below steps    Go to VM Virtual box -  select connected device in the list   Select Settings - Network-  Find out to which network the device is attached  For me it was  VirtualBox Host-Only Ethernet Adapter  2   In virtualbox go to Files- Preferences- Network- Host-Only Networks  and find out the IPv4 for the network specified in above step   By Hovering you will get the info    Provide this IP to access the localhost from emulator  The Port is same as you have provided while running publishing your services   Note  1   Make sure you have taken care of firewalls and inbound rules    Note  2   Please check this IP after you restart your machine  For some reason  even If I provided  Use the following IP  The Host-Only IP got changed

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I had the same issue when I was trying to connect to my IIS  NET Webservice from the Android emulator     install npm install -g iisexpress-proxy iisexpress-proxy 53990 to 9000 to proxy IIS express port to 9000 and access port 9000 from emulator like  http   10 0 2 2 9000    the reason seems to be by default  IIS Express doesn t allow connections from network https   forums asp net t 2125232 aspx Bad Request Invalid Hostname when accessing localhost Web API or Web App from across LAN

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if you are using some 3rd party package like node express or angular-cli  you will need to find the IP of your machine  and attach your host to that IP within the server startup config  instead of localhost   Then launch it from the emulator using the IP   For example  I had to use  ng serve -H 10 149 212 104 to use the angular-cli   Then from the emulator I used  http   10 149 212 104 4200

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I solved it with the installation of  Conveyor by Keyoti  in Visual Studio Professional 2015  Conveyor generate a REMOTE address  your IP  with a port  45455  that enable external request  Example     Conveyor allows you test web applications from from external tablets and phones on your network or from Android emulators  without http   10 0 2 2  lt hostport gt    The steps are in the following link    https   marketplace visualstudio com items itemName vs-publisher-1448185 ConveyorbyKeyoti

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If you are using IIS Express you may need to bind to all hostnames instead of just  localhost    Check this fine answer   https   stackoverflow com a 15809698 383761     Tell IIS Express itself to bind to all ip addresses and hostnames  In your  config file  typically  userprofile  My   Documents IISExpress config applicationhost config  or     solutionDir  vs config applicationhost config for Visual Studio   2015   find your site s binding element  and add   lt binding protocol  http  bindingInformation    8080      gt     Make sure to add it as a second binding instead of modifying the existing one or VS will just re-add a new site appended with a  1   Also  you may need to run VS as an administrator

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I have a webserver running on my localhost    If I open up the emulator and want to connect to my localhost I am using 192 168 x x  This means you should use your local lan ip address  By the way  your HttpResponseException  Bad Request  doesn t mean that the host is not reachable    Some other errors lead to this exception

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Since 10 0 2 2 is not a secure domain for Android you have to allow non-secured domains in your network configuration for API 28  where non-TLS connections are prevented by default   You may use my following configurations   Create a new file in main res xml network security config xml as    lt  xml version  1 0  encoding  utf-8   gt   lt network-security-config gt       lt domain-config cleartextTrafficPermitted  true  gt           lt domain includeSubdomains  true  gt localhost lt  domain gt           lt domain includeSubdomains  true  gt 10 0 2 2 lt  domain gt       lt  domain-config gt   lt  network-security-config gt    And point it in AndroidManifest xml   lt application               android networkSecurityConfig   xml network security config  gt

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you need to set URL as 10 0 2 2 portNr  portNr   the given port by ASP NET Development Server my current service is running on localhost 3229 Service svc  so my url is 10 0 2 2 3229  i d fixed my problem this way  i hope it helps

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BadRequest  is an error which usually got send by the server itself  see rfc 2616      10 4 1 400 Bad Request      The request could not be understood by the server due to malformed syntax  The client SHOULD   NOT repeat the request without modifications     So you got a working connection to the server  but your request doesn t fit the expecet form  I don t know how you create the connection  what headers are included  if there are any      but thats what you should checking for   If you need more help about  explain what your code is about and what it uses to connect to the Server  so we have the big picture   Here is a question with the same Problem     the answer was that the content-type wasnt set in the header

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1  Run ipconfig command in cmd  2  You will get result like this   3  Then use IPv4 Address of VMWare Network Adapter 1 followed by port number   In My Case its 8080  so instead of using localhost 8080  I am using 192 168 56 1 8080    Done

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After running your local host you get http   localhost  port number   here you found your port number    Then get your IP address from Command  Open your windows command and type ipconfig   In my case  IP was 192 168 10 33 so my URL will be http   192 168 10 33  port number     In Android  the studio uses this URL as your URL  And after that set your URL and your port number in manual proxy for the emulator

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Explanation why localhost is not available from emulators for anyone who has basic access problem  For sophisticated cases read other answers   Problem  Emulator has own local network and localhost maps itself to emulator  but NOT your host   Solution    Bind your server to 0 0 0 0 to make it available for emulator s network Get external IP address of your laptop  ifconfig command for Mac In Android  or Flutter app  use IP address of your external interface like  192 168 1 10 instead of localhost

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I resolved exact the problem when the service layer is using Visual Studio IIS Express  Just point to 10 0 2 2 port wont work  Instead of messing around the IIS Express as mentioned by other posts  I just put a proxy in front of the IIS Express  For example  apache or nginx  The nginx conf will look like     Mobile API  server        listen       8090      server name  default server       location             proxy pass http   localhost 54722              Then the android needs to points to my IP address as 192 168 x x 8090

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To access localhost on Android Emulator   Add the internet permission from AndroidManifest xml   lt uses-permission android name  android permission INTERNET    gt   Add android usesCleartextTraffic  true   more details here   Run the below-mentioned command to find your system IP address    ifconfig   grep  inet     grep -v 127 0 0 1   Copy the IP address obtained from this step  A    Run your backend application  which you can access at localhost or 127 0 0 1 from your sytem  Now in android studio  you can replace the URL if you re using in code or You can use the ip address obtained from step A  and try opening in web browser  Like this http   192 168 0 102 8080    Don t forget to add PORT after the IP address  in my case app was running on 8080 port so I added IP obtained in  A  with the port 8080

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localhost seemed to be working fine in my emulator at start and then i started getting connection refused exception i used 127 0 2 2 from the emulator browser and it worked and when i used this in my android app in emulator it again started showing the connection refused problem   then i did ifconfig and i used the ip 192 168 2 2 and it worked perfectly

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