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How do you properly turn on Logging for Apache Commons HttpClient
Right now I am doing this and getting no log messages except the one I triggered explicitly as a test:
public class HttpTest1 { static Log log = LogFactory.getLog(Class.class); public static void main(String[] args) throws ClientProtocolException, IOException{ log.warn("Logging Works"); System.setProperty("org.apache.commons.logging.Log", "org.apache.commons.logging.impl.SimpleLog"); System.setProperty("org.apache.commons.logging.simplelog.showdatetime", "true"); System.setProperty("org.apache.commons.logging.simplelog.log.httpclient.wire", "debug"); System.setProperty("org.apache.commons.logging.simplelog.log.org.apache.commons.httpclient", "debug"); DefaultHttpClient client = new DefaultHttpClient(); HttpGet method = new HttpGet("http://www.google.com"); HttpResponse response = client.execute(method); BufferedReader rd = new BufferedReader(new InputStreamReader( response.getEntity().getContent())); String line = ""; while ((line = rd.readLine()) != null) { System.out.println(line); } } } Output:
Feb 28, 2012 2:16:31 PM httpTest.HttpTest1 main WARNING: Logging Works <!doctype html><html itemscope itemtype="http://schema.org/WebPage"><head><meta http-equiv="content-type" content="text/html; charset=ISO-8859-2"><meta itemprop="image" content="/images/google_favicon_128.png"><title>Google</title><script>window.google={kEI:"stNMT4yfMInFtAaK_5yGDw",getEI:function(a){var d;while(a&&!(a.getAttribute&&(d=a.getAttribute("eid"))))a=a.parentNode;return d||google.kEI},https:function(){return window.location.protocol=="https:"},kEXPI:"33551,34324,34904,35055,35091,36604,36683,36934,36946,37017",kCSI:{e:"33551,34324,34904,35055,35091,36604,36683,36934,36946,37017",ei:"stNMT4yfMInFtAaK_5yGDw"},authuser:0, ml:function(){},kHL:"sl",time:function(){return(new Date).getTime()},log:function(a,d,f,h){var e=new Image,g=google,k=g.lc,i=g.li,m="";e.onerror=(e.onload=(e.onabort=function(){delete k[i]}));k[i]=e;if(!f&&d.search("&ei=")==-1)m="&ei="+google.getEI(h);var j=f||"/gen_204?atyp=i&ct="+a+"&cad="+d+m+"&zx="+google.time(),b=/^http:/i;if(b.test(j)&&google.https()){google.ml(new Error("GLMM"),false,{src:j}); 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Note: Log4j is not included in the HttpClient distribution.
Wire Logging The wire log is used to log all data transmitted to and from servers when executing HTTP requests. This log should only be enabled to debug problems, as it will produce an extremely large amount of log data, some of it in binary format.
You do not need to explicitly close the HttpClient, however, (you may be doing this already but worth noting) you should ensure that connections are released after method execution. Edit: The ClientConnectionManager within the HttpClient is going to be responsible for maintaining the state of connections.
The HttpClient library provides efficient, up-to-date, and feature-rich implementation client site of the HTTP protocol. Indeed as a library, HttpClient doesn't force logging implementation. With this intention, version 4.5, provides logs with Commons Logging. Similarly, the latest version, 5.1, uses a logging facade provided by SLF4J.
HTTP Logging is enabled with UseHttpLogging, which adds HTTP logging middleware. By default, HTTP Logging logs common properties such as path, status-code, and headers for requests and responses. Add the following line to the appsettings.Development.json file at the "LogLevel": { level so the HTTP logs are displayed:
ASP. NET Core HTTP Logging is a middleware that logs information about HTTP requests and HTTP responses. HTTP logging provides logs of: Record information about incoming requests and responses. Filter which parts of the request and response are logged. Filtering which headers to log.
Filtering which headers to log. HTTP Logging can reduce the performance of an app, especially when logging the request and response bodies. Consider the performance impact when selecting fields to log. Test the performance impact of the selected logging properties. HTTP Logging can potentially log personally identifiable information (PII).
I faced same problem today. And I found out a solution for this problem. It's pretty simple. Just add jcl-over-slf4j dependency to forward JCL logging (Apache Commons Logging) to slf4j.
<dependency> <groupId>org.slf4j</groupId> <artifactId>jcl-over-slf4j</artifactId> <version>1.7.5</version> </dependency> After that you can config log file as Log4j Examples. If you use logback you can put the following to your logback.xml
<logger name="org.apache.http" level="DEBUG"/> Or if you use log4j
log4j.logger.org.apache.http=DEBUG This is due to the HttpClient version mix-up. Your code is obviously using HttpClient 4.x API, while the logging settings are for an older Commons HttpClient release (3.x).
Please refer to the HttpClient 4.x logging guide for instructions on logging configuration for various logging toolkits.
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