curl Failed to connect to localhost port 80

Question

My hosts file maps 127 0 0 1 to localhost      curl -I  localhost  curl   7  Failed to connect to localhost port 80  Connection refused   And then     curl -I 127 0 0 1 HTTP 1 1 200 OK Server  nginx 1 2 4 Date  Wed  09 Apr 2014 04 20 47 GMT Content-Type  text html Content-Length  612 Last-Modified  Tue  23 Oct 2012 21 48 34 GMT Connection  keep-alive Accept-Ranges  bytes   In my hosts file I have   127 0 0 1   localhost   It appears that curl command fails to recognize entries in   etc hosts  Can someone explain why   update  i ve yet to try this but i ve discoved you can configure nginx to respond to ipv4 and ipv6

User · Answer

I also had problem with refused connection on port 80. I didn't use localhost.

curl --data-binary "@/textfile.txt" "http://www.myserver.com/123.php"

Problem was that I had umlauts äåö in my textfile.txt.

User · Answer

In my case  the file    curlrc had a wrong proxy configured

User · Answer

If anyone else comes across this and the accepted answer doesn t work  it didn t for me   check to see if you need to specify a port other than 80  In my case  I was running a rails server at localhost 3000 and was just using curl http   localhost  which was hitting port 80    Changing the command to curl http   localhost 3000 is what worked in my case

User · Answer

Since you have a   1 localhost line in your hosts file  it would seem that curl is attempting to use IPv6 to contact your local web server    Since the web server is not listening on IPv6  the connection fails   You could try to use the --ipv4 option to curl  which should force an IPv4 connection when both are available

[curl] curl Failed to connect to localhost port 80

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