Need some help in composing the string returned by a self designed web server (minimalistic on a spark / arduino chip)
QUESTION: how do I end the transmission back to the requestor at the server side.
when I do
curl -d "command" --max-time 5 192.x.y.z
my mini server gets "the command" and returns the proper string to curl. curl prints it, but curl still times out waiting for something else.
what do I need to send to end the transmission?
Any pointer to a web page where I can find this is welcome ..
Karl
end string returned to cURL
- kw123 offline
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end string returned to cURL
- RogueProeliator offline
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Re: end string returned to cURL
Are you setting the Content-Length HTTP header during your return? You might want to post what headers you are sending back for us to take a quick look.
Adam
Adam
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Re: end string returned to cURL
I am just sending plain text. Also tried <html>text</html>
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- RogueProeliator offline
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Re: end string returned to cURL
If you are implementing your own server you are responsible for sending back a response in the proper HTTP protocol... an example response would be something like this:
You can look up what the values mean -- and there are a ton of headers possible, but that would be a typical set. You may want to end the content with a newline to be safe, though I cannot quite recall if that is required.
Adam
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HTTP/1.1 200 OK
Date: Tue, 30 Sep 2014 16:58:00
Expires: -1
Cache-Control: private, max-age=0
Content-Type: text/html; charset=ISO-8859-1
Content-Length: [LENGTH RETURNING]
<html>...</html>
You can look up what the values mean -- and there are a ton of headers possible, but that would be a typical set. You may want to end the content with a newline to be safe, though I cannot quite recall if that is required.
Adam
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Re: end string returned to cURL
with
just sending the received data back from the spark, I get:
used the most basic header, sending 8 characters, they come through including the empty line after header... what am I doing wrong?
any pointer or advice welcome
Karl
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curl -d "{12345678}" --max-time 5 192.x.y.x
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server.println("HTTP-Version: HTTP/1.0 200 OK");
server.println("Content-Length: 8");
server.println("Content-Type: text/html");
server.print("\r\n");
server.println(buf); // this is the data received excl the {}
just sending the received data back from the spark, I get:
- Code: Select all
HTTP-Version: HTTP/1.0 200 OK
Content-Length: 8
Content-Type: text/html
12345678
curl: (28) Operation timed out after 5229 milliseconds with 116 out of -1 bytes received
used the most basic header, sending 8 characters, they come through including the empty line after header... what am I doing wrong?
any pointer or advice welcome
Karl
- RogueProeliator offline
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Re: end string returned to cURL
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server.println("HTTP-Version: HTTP/1.0 200 OK");
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server.println("HTTP/1.0 200 OK");
Adam
- kw123 offline
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Re: end string returned to cURL
This seems to work..
thx Adam
Karl
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server.println("HTTP/1.0 200 OK");
// server.println("HTTP-Version: HTTP/1.0 200 OK ");
server.print("Content-Length: ");
server.println(numberOfChar+2);
server.println("Content-Type: text/plain ");
server.print("\r\n{");
server.print(buf);
server.println("}");
thx Adam
Karl
- Code: Select all
curl -d "{1234567890xx}" --max-time 2 192.168.1.204
{1234567890xx}
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