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问题 I'm using a 32-bit microcontroller (program code written in C) with very limited flash space that is communicating with a cellular module. I have an Azure account setup with an IoT Hub and I would like to send some device-to-cloud messages to my IoT Hub. I have tested and confirmed both HTTP and HTTPS communication to other servers. However, I can't find anywhere that specifies what the required HTTP headers are for sending a device-to-cloud message. Can anyone provide a description of the

问题 Where is the HTTP/1.1 mandatory Host header field in HTTP request messages generated by the requests Python library? import requests response = requests.get("https://www.google.com/") print(response.request.headers) Outputs this: {'User-Agent': 'python-requests/2.22.0', 'Accept-Encoding': 'gzip, deflate', 'Accept': '*/*', 'Connection': 'keep-alive'} 回答1: The HOST header is not being added to the request by requests by default. If it is not explicitly added then the decision is delegated to

问题 Where is the HTTP/1.1 mandatory Host header field in HTTP request messages generated by the requests Python library? import requests response = requests.get("https://www.google.com/") print(response.request.headers) Outputs this: {'User-Agent': 'python-requests/2.22.0', 'Accept-Encoding': 'gzip, deflate', 'Accept': '*/*', 'Connection': 'keep-alive'} 回答1: The HOST header is not being added to the request by requests by default. If it is not explicitly added then the decision is delegated to

问题 I am POST-ing an image with HttpClient and it works well for files with Latin names, but as soon as a name contains any non-ASCII characters it gets transformed to a sequence of question marks. If I create an html form and use a browser to post the file, the file name is sent in UTF8 and the target server perfectly accepts it. using (var client = new HttpClient()) { var streamContent = new StreamContent(someImageFileStream); streamContent.Headers.Add( "Content-Disposition", "form-data; name=\

问题 I am POST-ing an image with HttpClient and it works well for files with Latin names, but as soon as a name contains any non-ASCII characters it gets transformed to a sequence of question marks. If I create an html form and use a browser to post the file, the file name is sent in UTF8 and the target server perfectly accepts it. using (var client = new HttpClient()) { var streamContent = new StreamContent(someImageFileStream); streamContent.Headers.Add( "Content-Disposition", "form-data; name=\

问题 I use simple code to get html for http://www.ip-adress.com, but it shows error http code 403. I try it in other website like google.com in program, it can work. i can also open www.ip-adress.com in browse, why i can't use it in java program. public class urlconnection { public static void main(String[] args) { StringBuffer document = new StringBuffer(); try { URL url = new URL("http://www.ip-adress.com"); URLConnection conn = url.openConnection(); BufferedReader reader = new BufferedReader

问题 I use simple code to get html for http://www.ip-adress.com, but it shows error http code 403. I try it in other website like google.com in program, it can work. i can also open www.ip-adress.com in browse, why i can't use it in java program. public class urlconnection { public static void main(String[] args) { StringBuffer document = new StringBuffer(); try { URL url = new URL("http://www.ip-adress.com"); URLConnection conn = url.openConnection(); BufferedReader reader = new BufferedReader

问题 I use simple code to get html for http://www.ip-adress.com, but it shows error http code 403. I try it in other website like google.com in program, it can work. i can also open www.ip-adress.com in browse, why i can't use it in java program. public class urlconnection { public static void main(String[] args) { StringBuffer document = new StringBuffer(); try { URL url = new URL("http://www.ip-adress.com"); URLConnection conn = url.openConnection(); BufferedReader reader = new BufferedReader

问题 I'm running a node.js server A which uses superagent to issue HTTP requests to another server B. I investigated the request on server B and saw the the header connection being close and the httpVersion being 1.1 : var http = require('http'); var request = require('superagent'); http.createServer(function (req, res) { res.writeHead(200, {'Content-Type': 'text/plain'}); res.write('req.httpVersion seen on server:' + req.httpVersion); res.write('\nreq.headers.connection seen on server:' + req

问题 That error message logged to the chrome console from a long-pending request after around 15 minutes. It looks client-side error because server processing still worked. I did not find any article related to this error message. can any buddy let me know how to solve this issue? 回答1: According to the chromium source I think it means that a spdy ping timed out. ... {net::ERR_EMPTY_RESPONSE, "http.response.empty"}, {net::ERR_HTTP2_PING_FAILED, "spdy.ping_failed"}, {net::ERR_HTTP2_PROTOCOL_ERROR,