Could not get any response response when using postman with subdomain

Question

I am using postman to test an API I have  all is good when the request does not contain sub-domain  however when I add a sub-domain to URL I am getting this response      Could not get any response      There was an error connecting to http   subdomain localhost port api       Why this might have happened       The server couldn t send a response Ensure that the backend is working   properly      Self-signed SSL certificates are being blocked Fix this by turning off    SSL certificate verification  in Settings   General      Proxy configured incorrectly Ensure that proxy is configured correctly   in Settings   Proxy      Request timeout Change request timeout in Settings   General   If I copy the same URL from postman and paste it into the browser I get a proper response  is there some kind of configurations I should do to make postman work with sub-domains

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Postman for Linux Version 6 7 1 - Ubuntu 18 04 - linux 4 15 0-43-generic   x64  I had the same problem and by chance I replaced http   localhost with http   127 0 0 1 and everything worked   My etc hosts had the proper entries for localhost and https   localhost requests always worked as expected   I have no clue why changing localhost for http with 127 0 0 1 solved the issue

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We got this confusing error when a user accidentally copy pasted a leading space character in an environment variable used to build the URL   Example   The request s URL was set to  http    URL  blah  The  URL  environment variable had a value of   hostname     notice the leading space character      This caused Postman to try to access http    hostname blah which gave this error message

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In my case it was invisible spaces that postman didn t recognize  the above string of text renders as without spaces in postman  I disabled SSL certificate Validation and System Proxy even tried on postman chrome extension which is about to be deprecated   but when I downloaded and tried Insomnia and it gave those red dots in the place where those spaces were  must have gotten there during copy paste

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My issue was by putting wrong parameters in the header  the requested parameters was Authorization  Token  lt string gt   and is was trying Authorization Token   lt string gt

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I came up with this solution   In postman go to setting --  proxy And off Global Proxy Configuration on the Use System Proxy  And go to windows host configure file  C  Windows System32 drivers etc hosts  Open that file in administrator mode  And add the sub domain to hosts file

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In postman go to setting --  proxy And off Global Proxy Configuration

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I just experienced this error  In my case  the path was TOO LONG  So url like that gave me this error in postman  fake example   http   127 0 0 1 5000 api batch upload import deactivate from ready folder   whereas  http   127 0 0 1 5000 api batch upld impt deac ready folder   worked fine   Hope it helps someone who by accident read that far

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The solution for me  as I m using the deprecated Postman extension for Chrome  to solve this issue I had to    Call some GET request using the Chrome Browser itself  Wait for the error page  Your connection is not private  to appear  Click on ADVANCED and then proceed to  url   unsafe  link    After this  requests through the extension itself should work

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You just need to turn SSL off to send your request   Proxy and others come with various errors

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In my case the  corporate  proxy was using a self-signed SSL certificate which Postman disliked  I discovered it by activating  View- Show Postman console and retrying the request  The console then showed the certificate error  In Settings- General I disabled  SSL certificate verification

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I had the same issue   Turned out my timeout was set too low  I changed it to 30ms thinking it was 30sec  I set it back to 0 and it started working again

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For anyone who experienced this issue with real domain instead of localhost and couldn t solve it using ANY OF THE ABOVE solutions   Try changing your Network DNS  WIFI or LAN  to some other DNS  For me  I used Google DNS 8 8 8 8  8 8 4 4 and it worked

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In my case  The issue was that for UAT environment  API URL will start with Http instead of https  Also  the backend assigns different ports for both Http and https   for example    http   10 12 12 31 2001 api example   - is correct for me  https   10 12 12 31 2002 api example   - is wrong for me  Because I was using https and 2002 port for hitting the UAT environment  So I am getting could not get any response error in postman

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You mentioned you are using a CER certificate     According to the Postman page on certificates   Choose your client certificate file in the CRT file field  Currently  we only support the CRT format  Support for other formats  like PFX  will come soon   The name of the extension CER  CRT doesn t make the certificate that type of certificate but  these are the excepted extensions names   CER is an X 509 certificate in binary form  DER encoded   CRT is a binary X 509 certificate  encapsulated in text  base-64  encoding   You can use OpenSSL to change a CER file into a CRT file   I have not had good luck with it but it looks like this      openssl x509 -inform PEM -in certificate cer -out certificate crt   or     openssl x509 -inform DER -in certificate cer -out certificate crt

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First Go to Settings in Postman    Off the SSL certificate verification in General Tab     Off the Global Proxy Configuration and Use System Proxy in Proxy Tab     Make Request Timeout to 0  Zero

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In my case  MVC wasn t able to serialize the results  I accidentally used a model instead of DTO   I debugged down to passing a simple string  which worked  Once I fixed the serialization it all came up

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Unchecking proxy and SSL Certificate Verification didn t work for me   Unsetting PROXY environment variables did the trick   export http proxy  export ftp proxy  export https proxy    Change to the directory where Postman is installed and then     Postman

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I had the same issue  It was caused by a newline at the end of the  Authorization  header s value  which I had set manually by copy-pasting the bearer token  which accidentally contained the newline at its end

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None of these solutions works for me  Postman is not sending any request to the server because postman is not finding the host  So  if you modify your  etc hosts to 127 0 0 1 localhost 127 0 0 1 subdomain localhost  It works for me

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After all the above methods like turning OFF SSL certificate verification  turning ON only Use System Proxy and removing HTTP PROXY and HTTPS PROXY system environment variables  it worked   Note  Had to restart the Postman app  since the environment variables were changed

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For me it was the http   localhost instead of https   localhost

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If you get a  Could not get any response  message from Postman native apps while sending your request  open Postman Console  View   Show Postman Console   resend the request and check for any error logs in the console   Thanks to numaanashraf

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For me  it was that route that I was calling in my node server wasn t returning anything  Adding      return res status 200  json           message   success            response   success               to the route I was calling resolved the issue

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In my case it was a misconfigured subnet  Only one of the 2 subnets in the ELB worked   I figured this out by doing a nslookup and trying to curl the returned IPs directly  Only one worked   Postman just kept using the misconfigured one

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If all above methods doesn t work check your environment variables  And make sure that the following environments are not set  If those are set and not needed by any other application remove them   HTTP PROXY HTTPS PROXY   Reference link

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In my case  I forgot to set the value of the variable in the  CURRENT VALUE  field

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For me what worked was to add 127 0 0 1    subdomain localhost to my host file  On OSX that was  etc hosts  Not sure why that was necessary as I could reach the subdomain from chrome

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For me the issue was that the Content-Length was too big  I placed the content of the body in NotePad   and counted the characters and put that figure in PostMan and then it worked   I know it does not directly answer why the op s sub-domain was not working but it might help out someone

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Hi This issue is resolved for me   setting - general -  Requesttimeout in ms   0

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I got the same  Could not get any response  issue because of wrong parameter in header  I fixed it by removing parameter HOST out of header    PS  Unfortunately  I was pushed to install the other software to get this information  It should be great to get this error message from Postman instead of getting general nonsense

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When getting the following error    you need to do the following   Step 1  In Postman  click the wrench icon  go to settings  then go to the Proxy tab       Step 2  Create a custom Proxy   This article explains how to create a custom proxy  After you create the custom Proxy  make sure you turn the Proxy toggle button to off   I put 61095 in for the proxy server and it worked for me     Step 3    Success

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solution is very simple if you are using asp net core 2 application   Inside ConfigureServices method inside  startup cs file all this line   services AddMvc                    SetCompatibilityVersion CompatibilityVersion Version 2 1                   AddJsonOptions x   gt  x SerializerSettings ReferenceLoopHandling   Newtonsoft Json ReferenceLoopHandling Ignore

[subdomain] "Could not get any response" response when using postman with subdomain

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