dlang-requests
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Published
20 hours ago •
ikod
ikod
No automatic Content-Length on POST
EndeavourOS/Arch x86_64, requests v2.1.3.
When sending a POST with a body, a Content-Length header is not automatically added, even when posting a string (which is not chunked and has a known length).
import std;
import requests;
void main()
{
auto res = postContent("http://httpbin.org/post", "Hello, World!");
writeln(res);
}
{
"args": {},
"data": "Hello, World!",
"files": {},
"form": {},
"headers": {
"Accept-Encoding": "gzip,deflate",
"Content-Type": "application/octet-stream",
"Host": "httpbin.org",
"Transfer-Encoding": "chunked",
"User-Agent": "dlang-requests",
"X-Amzn-Trace-Id": "Root=1-65b758d9-61bde2ce4c6309560ebd0cc7"
},
"json": null,
"origin": "194.117.188.126",
"url": "http://httpbin.org/post"
}
This is not a problem with httpbin.org, but some services do require the header. An example is batsign.me, with which you can mail small reports to yourself by sending a quick POST to a custom URL.
import std;
import requests;
void main()
{
auto res = postContent("https://batsign.me/at/[email protected]/asdfasdf", "Warning: server is down");
writeln(res);
}
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>411 Length Required</title>
</head><body>
<h1>Length Required</h1>
<p>A request of the requested method POST requires a valid Content-length.<br />
</p>
<hr>
<address>Apache/2.4.38 (Debian) Server at batsign.me Port 443</address>
</body></html>
It can be worked around by using Request.post instead of postContent and manually adding the header.
import std;
import requests;
void main()
{
enum body_ = "Warning: server is down";
auto rq = Request();
rq.addHeaders([ "Content-Length": body_.length.to!string ]);
auto res = rq.post("https://batsign.me/at/[email protected]/asdfasdf", body_);
writeln(cast(string)res.responseBody);
}
Looking through the examples in the readme, it seems like the length is properly calculated and added if you use multi-part forms? (I didn't test and verify)
But it doesn't for simple strings at least. Is this intended behaviour?
