#File host qreader code

Return ndSync(parameters, *parameters, **options)įile '/home/ubox122/lib/python3.8/site-packages/qpython/qconnection.py', line 304, in sendSync

#File host qreader code

This is the stack trace of the above code File '/usr/lib/python3.8/code.py', line 90, in runcodeįile '/home/ubox122/Practice/lib/python3.8/site-packages/qpython/qconnection.py', line 386, in _call_ I have also tried running more basic codes given in the documentation like these: > with qconnection.QConnection(host = 'localhost', port = 5001, pandas = True) as q: I tried running the script given in the qpython documentation: īut this gives me: : Attempt to read data out of buffer bounds For this, I installed the following versions of: Message that lacks a Host header field or contains more than one.Īs mentioned by Darrel Miller, the complete specs can be found in RFC7230.I want to stream my data(which I get from the third party APIs) into the KDB+ database. AĤ00 (Bad Request) status code will be sent to any HTTP/1.1 request Host: In the MDN Documentation on the 'Host' header they actually phrase it like this:Ī Host header field must be sent in all HTTP/1.1 request messages. That means the minimum required information in an HTTP-(GET-)request is the first line containing METHOD RESOURCE and PROTOCOL VERSION and at least the Host header, like this: GET /someresource.html HTTP/1.1 With an unsecured connection, there is no Server Name Indication at all, so the Host header is still valid (and necessary).Īnother fun fact: Most webservers (if not all) reject your HTTP request if it does not contain exactly one Host header, even if it could be omitted because there is only the default vhost configured. This has been overcome with Server Name Indication however, that again breaks some privacy, as the server name is now transferred in plain text again, so every man-in-the-middle would see which hostname you are trying to connect to.Īlthough the webserver would know the hostname from Server Name Indication, the Host header is not obsolete, because the Server Name Indication information is only used within the TLS handshake. That meant one SSL-secured domain per IP address / port-combination. But because the client sends that information only over the encrypted channel (which means: after the certificate has already been sent), the server had to assume you browsed the default host. However, in order to know what certificate to use, the webserver should have known the addressed hostname in advance. That means: You get it right, although saying 'multiple hosts' may be somewhat misleading: The host (the addressed machine) is the same, what really gets resolved to the IP address are different domain names (including subdomains) that are also referred to as hostnames (but not hosts!).Īlthough not part of the question, a fun fact: This specification led to problems with SSL in the early days because the web server has to deliver the certificate that corresponds to the domain the client has addressed. This default vhost is used whenever the host header does not match any of the configured virtual hosts. This is possible because in your webserver you can (and if I'm not mistaken you must) set up one vhost to be the default host.

In this case, you still have the possibility to read that header manually in your web app if you want to provide different behavior based on different domains addressed. You can even have the same virtual host using several aliases (= domains and wildcard-domains). The Host Header tells the webserver which virtual host to use (if set up).