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Java Network Q&A
Java Network Q&A » HttpClient » HttpClient 1 

1. Best Practice to Use HttpClient in Multithreaded Environment

All the while, I am using HttpClient in multithreaded environment. For every threads, when they initiate a connection, they will create a complete new HttpClient instance. Recently, I discover, by using this ...

2. How to get html source of a webpage?

I am using

to login to websites through java. How can I get the html source of the webpage after having logged in to a website.

3. Is Jakarta HttpClient sutitable for the following task?

I try to talk to a server, by telneting to it, and send the following command through telnet terminal :

POST /%5bvUpJYKw4QvGRMBmhATUxRwv4JrU9aDnwNEuangVyy6OuHxi2YiY=%5dImage? HTTP/1.1
Content-Type: application/x-www-form-urlencoded
Content-Length: 164

This works very fine. Now, I wish I ...

4. Apache HttpClient 4.0. Weird behavior

I'm using Apache HttpClient 4.0 for my web crawler. The behavior i found strange is: i'm trying to get page via HTTP GET method and getting response about 404 HTTP error. ...

5. Apache HttpClient doesn't work

I have: ubuntu-9.10-desktop-amd64 + NetBeans6.7.1

  1. I just downloaded "Commons HttpClient 3.1 (legacy)" from .
  2. I created new application with IDE NetBeans.
  3. I focused on Projects -> Libraries -> Add JAR/Folder ...

6. Java HttpClient NoSuchAlgorithmException

I'm using IBM's build of Java with HttpClient and having little success. Whenever I use the HttpClient object's executeMethod(), I get a NoSuchAlgorithmException.

Dec 22, 2009 2:59:58 PM createPlatformSSLContext()

7. httpclient get and put

here is what i want to do and need some help in it. I have a source url and a destination url. what i want to do is copy a file from ...

8. retriving complete webpage using httpclient

i am a new bie to java.i had a problem i need to save a complete webpage(with all its contents like images,css,javascript e.t.c) like how we can do with save as-->complete ...

9. HttpClient - getting incorrect page source

I used HttpClient and GetMethod to get the page source of the URL :
But somehow I always end up getting page source of :
Can anyone tell me why and how ...

10. How to force disconnection in commons-httpclient?

I use commons-httpclient to send queries to a Web server. The Web server never closes connections, but has a small memory leak associated to the connection context. I would therefore like to ...

11. How to properly encode "[" and "]" in queries using Apache HttpClient?

I've got a GET method that looks like the following:

 GetMethod method = new GetMethod("http://host/path/?key=[\"item\",\"item\"]");
Such a path works just fine when typed directly into a browser, but the above line when ...

12. NoClassDefFoundError: HttpClient 4 (APACHE)

I am using HC APACHE.
I have added both httpcore-4.0.1.jar and httpclient-4.0.1.jar in the classpath of netbeans.
I am getting error:
java.lang.NoClassDefFoundError: org/apache/http/impl/client/DefaultHttpClient My Code is as follows. Please help.

import org.apache.http.client.HttpClient;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.BasicResponseHandler;
import org.apache.http.impl.client.DefaultHttpClient;

public ...

13. BindException/Too many file open while using HttpClient under load

I have got 1000 dedicated Java threads where each thread polls a corresponding url every one second.

public class Poller { 
    public static Node poll(Node node) { ...

14. Apache HTTPClient returns an empty page

I am using the Apache HTTPClient for Java and I'm facing a really strange issue. Sometimes when I try to get a dynamically generated page it returns its actual content, but ...

15. Just need someone familiar with HTTPClient to check over a piece of code

here are two little helper methods I have made for downloading files. I have had to mix and match different tutorials of the web to get what I have here. Now ...

16. Why switch from HttpClient version 3 to 4

My Java application is developed using HttpClient 3. Is there any advantages of switching to version 4? Is there a changelog. article, blog entry or something that describes what's new?

17. Getting the text of a webpage with HTTPClient

I'm just getting started with HTTPClient, and I want to take a webpage and extract out the raw text from it minus all the html markup. Can HTTPClient accomplish that? ...

18. HttpClient NoClassDefFoundError

I am trying to run a sample application from HttpClient 4.0.1. It is the file from the examples section. I put in these files in the classpath: apache-mime4j-0.6.jar;commons-codec-1.3.jar;commons-logging-1.1.1.jar;httpclient-4.0.1.jar;httpcore-4.0.1.jar;httpmime-4.0.1.jar ...

19. confused about httpclient performance

I'm just getting started writing a simple web crawler to get info on links we have coming in to our system. I'm using httpclient 4.x. I have about 100 threads running ...

20. What port does httpclient use?

What port does httpclient use? 80, 8080, ....?

21. HttpClient unable to 302 this link?

I found a URL that httpclient doesn't seem to be handling redirects on: should 302 to: when I look at the headers in the browser everything looks good:

HTTP/1.1 302 ...

22. What happens if a HttpClient.execute() is interrupted?

I am calling HttpClient.execute() in a background thread. Does it throw an IOException, when I interrupt the thread?

23. Getting Unexpected 401 from Apache HTTPClient Basic Auth

I'm attempting to do basic auth with Apache HTTPClient 4.x using the example from the site, the only change being that I've extracted some details out into constants, however ...

24. where's the javadoc / other documentation for HTTPclient?

I get a 404 Not Found from -- does anyone know where the httpclient 4.0.x javadoc lives? (directed to that link from The Primer is also ...

25. httpclient put problem

I have been given an api which states that it requires:

URL http://server/a/messages.xml

HTTP Method POST (even though the soapui example  of this call uses PUT)

Input XML
<?xml version="1.0" encoding="UTF-8"?>
  <content>Post message</content>

26. InputStreamBody equivalent in HttpClient 3.x

In a previous question of mine I got the following answer, which is perfect, but if I want to write my client with HttpClient 3.x, what is the equivalent code? Especially "InputStreamBody(new FileInputStream(file)"?


27. Reg : Site inconsistency for HttpClient

I have written code for HttpClient.MY programs works fine for Localhost.But when i run same program On remote machine I have found some issues. Issue are : Sometimes i found that my codes ...

28. Can I set HttpConnectionParams.setSoTimeout() after couple of readLine()

I am trying to write a JAVA based comet HTTP streaming. I am using apache httpClient 4.x for this. Since, it is comet HTTP streaming, all the events are coming to ...

29. java unit test mock HttpClient and webdav

Hello I have a class for doing webdav related operations such as creating a directory, Implementatiion can be seen below (the createDir method). The question is how to test it nicely, ...

30. Apache HTTPClient DeleteMethod Example Needed

Does anyone have an example of the Apache HTTPClient DeleteMethod? I can't find a complete example anywhere...

31. Converting from HttpClient 3 to 4

I've managed to make changes to everything but the following:

HttpClient client;
HttpPost method;   
client = new DefaultHttpClient();
method = new HttpPost(url); 

         InputStream ...

32. Workaround to not shutdown DefaultHttpClient() each time after usage

Each time I do a Http request I invoke this method

private JSONObject getRequest(HttpUriRequest requestType) {
        httpClient = new DefaultHttpClient(); // Creating an instance here

33. How to submit this form by httpclient?

I have a form blow

<FORM method=POST action="?do=add" name="add" enctype="multipart/form-data" accept-charset="utf-8">
<INPUT class="interfaceforms" name="title"></TD></TR>
<INPUT class="interfaceshortforms" name="season"></TD></TR>
<INPUT class="interfaceshortforms" name="episode"></TD></TR>
<INPUT class="interfaceforms" type="file" name="thumbnailfile">
Data sent:
Content-Disposition: form-data; name="title"

Grey's Anatomy
Content-Disposition: form-data; name="season"

Content-Disposition: form-data; name="episode"

Content-Disposition: form-data; name="thumbnailfile"; filename=""
Content-Type: application/octet-stream
How ...

34. HttpClient 2.0. Params "codified"

I have to use HttpClient 2.0 (can not use anything newer), and I am running into the next issue. When I use the method (post, in that case), it "codify" the ...

35. HttpClient 4.1, InputStreamEntity, automatically calculated length

In HttpClient 3.1 we had

   // The content length will be calculated automatically.
How can I achieve the same effect in 4.1 for InputStreamEntity?

36. HttpClient 4.1 does not return host value all the time

If you run the following code, you will see that the URI has a value of "null" for Host upon completion. This is invalid! It should always have a ...

37. Print contents of HttpParams / HttpUriRequest?

I have an HttpUriRequest instance, is there a way to print all the parameters it contains? For example, I can almost get them like:

HttpUriRequest req = ...

38. what the relationship between commons-httpclient and httpclient, both from apache

Any relationship or difference between those two libraries.

39. curl equivalent code written in httpclient : java

have a web-application running in tomcat, based on certain actions in my web-applications I need to write a java code which would trigger curl ( Curl would then query a third-party ...

40. HttpClient and FileUpload big files upload/download

I am writing a small test desktop app and I want to make it upload (to Servlet) and download (from Servlet) binary files >=1Gb length. I am just studying the Apache ...

41. How to get a list of files to be downloaded using HttpClient or Commons VFS?

I would want to know if there any another way to get a list of files to be downloaded from HttpServer,other than parsing the response using HttpClient. I would also like ...

42. HttpClient and ProgressListener - help to implement

I am just studying so I need your advice. I have found a code example which demos HttpClient progress listener. It is good but I have no idea how to implement ...

43. HttpClient API not saving image having size more than 1.9 kb

I have been stucked in a strange problem. I am using org.apache.http.impl.client.HttpClient api for an XML and media transfer beetween two web sites, now while reading a binary content (image in my case) ...

44. HttpClient - add CipherInputStream to MultipartEntity

I want to add an encripted stream to my multipartentity to upload it to my servlet but I don't know how to do that... Emm then MultipartEntity is quite limited as ...

45. Can I use httpclient 3.1 and 4.0 together?

Will using httpclient 3.1 and 4.0 together cause any problems?

46. Apache HttpClient random delays under high requests/second

I'm using Apache HttpClient to query HTTP/1.0 (without keep alive) server on localhost with around 20 POST requests/second. I have a TCP_NODELAY enabled like this:

val httpParams = new BasicHttpParams()
HttpConnectionParams.setTcpNoDelay(httpParams, true)
val client ...

47. HTTPClient MultipartEntity seems to be adding garbage text to StringBody parts

I am trying to use Apache Commons's HttpClient to send a multipart POST request with a binary file and a couple of string parameters. However, it seems that somewhere along the line, ...

48. Reference problem (I guess) when using boost::asio

I am building an HTTP client based on the example on HTTP server given at boost website. Now, the difference between that code and mine is that the example ...

49. How do I make a WebDav call using HttpClient?

Specifically I want to call MKCOL through HttpClient to create a folder for Apache Jackrabbit through the Sling REST API. I've tried variants of

BasicHttpEntityEnclosingRequest request = new BasicHttpEntityEnclosingRequest("MKCOL", restUrl);
But ...

50. How to only get a part of a HTML page? (Apache HttpClient 4)

What would be the best way to single out a part of an Html page wich I obtained with a request by HttpClient4 from Apache and Java? Specifically I need a ...

51. java HttpClient 403 forbidden problem?

I using HttpClient api to authenticate to a web site:

    DefaultHttpClient httpclient = new DefaultHttpClient();


52. Missing dependency for HttpClient

I'm using a HttpClient in a Java desktop application. I've added httpclient-4.0.1.jar and httpmime-4.0.1.jar to the build path, but I receive the error 'The type org.apache.http.HttpResponse cannot be resolved. It is ...

53. Accessing an iframe page through Apache's HttpClient

I've been working on parsing a website but am running into problems when one of the major pages I need to parse can only be found in an iframe. I can see ...

54. Migrating from HttpClient 3.x to 4.x

We have some code written using commons-httpclient-3.1 that needs to be converted to 4.1. I'm only somewhat familiar with this and am reading the 4.1 httpclient tutorial now. I see ...

55. How do I use HttpClient in Java to retrieve a binary file?

At the moment I can retrieve a text page as follows

    HttpClient client = new DefaultHttpClient();
    HttpGet get = new HttpGet(

56. Commons HttpClient getResponse takes very long 200 seconds

I changed nothing in this method but suddenly it takes very long. The code example below produces this error. EDIT: i extracted the method in a single java application and tried to ...

57. Pentaho, Kettle httpclient.CircularRedirectException

I have a problem when using the "webservice step" in pentaho-kettle. If I try to get a WSDL-File from a Webservice, which is already widely used (should not be a real ...

58. HttpClient throws 403

trying to access using apache HttpClient but keep getting 403. Can anyone help out? Been fiddling with this piece as a starting point:

DefaultHttpClient httpClient = new DefaultHttpClient();
HttpRequestBase method = new HttpGet(theUrl);
String ...

59. Query on ThreadSafeClientConnManager (Apache HttpClient 4.1.1)

Am using ThreadSafeClientConnManager Apache HttpComponenets-Client4.1.1 for my connection pool. When am releasing the connection back to the pool i say:

cm.releaseConnection(client,-1,TimeUnit.SECONDS); cm.closeExpiredConnections(); cm.closeIdleConnections(20, TimeUnit.SECONDS);
[Here cm is object of ThreadSafeClientConnManager] and ...

60. Java HttpClient emulating IE8 behaviour

Im using Apache HttpClient from HttpComponents projects. I have added custom trust and key managers to it to handle two-way authentication (my trust manager accepts everything and my key manager sends ...

61. How to install HttpClient library from Apache?

import org.apache.http.client.*; I want to import this java package it says that it doesn't exist, so where should I download this package from, and where to install it ?

62. submit curl command using DefaultHttpClient

i used a DefaultHttpClient to submit rest request to a website which should be the same as the following curl command: curl -H X-API-KEY:(api-key-goes-here) http://website-to-send-rest-request -d '{"channel":"channel1,"email":"test@test","name":"test"}' i tried to construct ...

63. Apache HttpClient and custom ports

I'm using the Apache HttpClient 4 and it works fine. The only thing that doesn't work is custom ports. It seems like the root directory is fetched and the port is ...

64. apache httpclient with HtmlUnit

Is there any way to use htmlunit with httpclient. I am writting web crawlers, for which we use apache httpclient very actively. But the problem comes when the page execute some ...

65. How to implement the HEAD method of httpclient

Hi I am downloading file from server. I have to take meta-information using HEAD method. andybody help me to implement the HEAD method to get "last-modified" date and modified-since date. here is ...

66. Adding support for Camellia Encryption in Java and HttpClient

I am using HttpClient 4 to GET an https URL. The server has valid certificates and in fact accessing the same https url from chrome works fine with no warnings. However from ...

67. How can i select multiple network interface using apache httpclient 4.1.2

I have multiple network interface(Like WIFI,LAN,LTE dougle).I am sending http request using apache httpclient 4.1.2. I want to select the network interface during sending the http request. I can see ...

68. handling return code 301 on httpclient

I am using httpclient to make a post call. But the curl spec given uses a curl --post301 url "some data". How do I go about doing that with httpclient? ...

69. Arduino HTTPClient not working

I have an Arduino with an Ethernet shield. I have the httpclient library, and I am trying to run the PachubeClient example. When I compile, it gives me many errors:

PachubeClient.cpp:25:25: error: Credentials.h: No ...

70. Instant Messenger in Coldfusion

I am new to ColdFusion & I want to create an instant messenger in it that is very much similar to the chat clients of Google and Facebook? So where to start ...

71. HttpClient HTTP/1.1 302 Object moved

This code works for my simple testing login form. It uses POST to log in and then print all the information to the screen from logged view. But it does ...

72. httpclient API for setHttpRequestRetryHandler

The HTTP commons client 4.12 tutorial section on exception handling clearly shows that one should be able to set a request retry handler by doing the following... httpclient.setHttpRequestRetryHandler(myRetryHandler); in eclipse I ...

73. How can we make pool domain specific using ThreadSafeClientConnManager (Apache HttpClient 4.1.1)

I am using ThreadSafeClientConnManager (Apache HttpClient 4.1.1) for my connection pool where in pool is managed for host:port level. Now, I want to extend the pool to Domain level, i.e connection ...

74. How to use a custom socketfactory in Apache HttpComponents

I have been trying to use a custom SocketFactory in the httpclient library from the Apache HTTPComponents project. So far without luck. I was expecting that I could just set a ...

75. Java Apache HttpClient EnityUtils block

I am currently working on a project which is using Apache HttpClient 4.1.2 and it retrieves some data from a website. What the application does: it goes to a webpage and then ...

76. apache's httpclient blocking on socketread even with soTimeout set

i have to fetch few html pages over the wire, and I am using apache's httpclient from the http-components package. I have set the connectionTimeout, soTimeout as 5000 milliseconds as well ...

77. How to submit a form with an image file using java?

Possible Duplicate:
How to upload a file using Java HttpClient library working with PHP - strange problem
I'm trying to create a script that can automatically ...

78. HttpClient and FtpClient

The difference is that one is an API for the FTP protocol, while the other is an API for the HTTP protocol. Those two protocols do very different things, so there isn't much overlap between them. HttpClient can be used to upload files to an HTTP server, if the server side is prepared to accept them. It can't create directories. FTP ...

79. HttpClient Frustration

I have a small app that I want to use to log into an ASP based secure website (https) via an HTML form. The problem I'm having is that the HttpClient doesn't seem want to log in - it just keeps responding with the login page. Any suggestions? Here is my method: public static void runUpdate(String site, String path, int port, ...

80. HttpClient

81. Httpclient

82. Apache Commons HTTPClient

Does anybody know how to dynamically observe the transfer rate being achieved by a threading reading URL input using the Apache Commons HTTPClient? For instance, I know how to calculate after retrieving a particular page...just using execution time versus file size, etc. I'm looking at retriving this info "on-the-fly" so-to-speak. I googled for it and came up with some unrelated links.....I ...

83. httpclient and followRedirects

I'm trying to connect to a web application on my local server (tomcat) using the HttpClient from this library commons-httpclient-2.0.2.jar. I get this message even if I set followRedirects to true (httpMethod.setFollowRedirects(true) 2005/01/19 08:05:08:435 EST [INFO] HttpMethodBase - Redirect requested but followRedirects is disabled java.lang.InternalError: the HTTP server return an error: 302 (Moved Temporarily) I have no idea how to solve ...

84. HttpClient PutMethod

85. package org.apache.commons.httpclient does not exist

Hi All I am getting the below error message while I am trying to compile my source code from netbean IDE 5.0 Compiling 1 source file to E:\MC\WeatherAPI\build\classes E:\MC\WeatherAPI\src\weatherapi\ package org.apache.commons.httpclient does not exist import org.apache.commons.httpclient.HttpClient; E:\MC\WeatherAPI\src\weatherapi\ package org.apache.commons.httpclient does not exist import org.apache.commons.httpclient.HttpStatus; E:\MC\WeatherAPI\src\weatherapi\ package org.apache.commons.httpclient.methods does not exist import org.apache.commons.httpclient.methods.GetMethod; E:\MC\WeatherAPI\src\weatherapi\ cannot find symbol symbol : class HttpClient location: ...

86. How do I generate a org.apache.commons.httpclient.ProtocolException ?

Not sure where to put this query so... Occasionally I'm getting a protocolException error returned, so I wrote a handler to catch it. I'd like to test that it is being caught and handled correctly. So, I now have a perl script on an apache server that I'm trying to mangle to return something which will generate this error, but all ...

87. Problems with Apache HttpClient

I've got a strange problem here with my application. What the application should do: Download the source code of web pages and save them to a local file. To do this, I use the Apache httpclient library. My problem: The downloader is a Swing application created with NetBeans and its GUI Builder. To download the web page, some lines of code ...

89. Using HttpClient

I recently was told that I should be using HttpClient to solve a problem I was working on, but I'm having a heck of a time downloading it appropriately and placing the files in the right place to make the sample code compile :confused: If anyone could be so kind as to check out the download page and assure me that ...

90. package org.apache.httpcomponents.httpclient.debian does not ex

Remove those two things from your CLASSPATH environment variable, that isn't really used anymore. If you are runinng/compiling from the command line then include the jar listed above on your classpath (not the directory containing it, the actual jar) using the -cp option. If you are using an IDE then include that jar as a library in your project.

91. Importing Hotmail Address Book using Jakarta HttpClient

are you having issues with the initial login, or is hotmail successfully taking your information, but failing to remember it when you access more of the site for address book information gathering? If the first part is happening, you're probably not setting up your connection within a SSL environment correctly (I'm only guessing that's what hotmail uses, as I'm not a ...

92. Problems using HttpClient with Java Web Start - Advise needed

Hi All, I am trying to run a client application over webstart, where the application uses HttpClient to get data from the host where it was downloaded. But the access attempt results in the following errors. java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at com.sun.javaws.Launcher.executeApplication(Unknown Source) at com.sun.javaws.Launcher.executeMainClass(Unknown Source) at com.sun.javaws.Launcher.continueLaunch(Unknown Source) at com.sun.javaws.Launcher.handleApplicationDesc(Unknown Source) ...

93. Urgent- Java HttpClient - processWWWAuthChallenge .

String strURL = args[0]; String strXMLFilename = args[1]; File input = new File(strXMLFilename); PostMethod post = new PostMethod(strURL); post.setRequestEntity(new InputStreamRequestEntity( new FileInputStream(input), input.length())); // Specify content type and encoding // If content encoding is not explicitly specified // ISO-8859-1 is assumed post.setRequestHeader( "Content-type", "text/xml; charset=ISO-8859-1"); // Execute request try { HttpClient httpclient = new HttpClient(); httpclient.getState().setCredentials(new AuthScope("localhost", 2005,"realm"), new UsernamePasswordCredentials("root","changeme"));

95. HttpClient Return

96. package org.apache.commons.httpclient does not exist

Hello there I just tried to test and in netbeans. To do so I included all the jar files from httpcomponents-client-4.0.1/lib/ in the netbeans project classpath. As far as it seems, this jar files do not include package org.apache.commons.httpclient because to start with I am getting errors at these sentences: import org.apache.commons.httpclient.*; import org.apache.commons.httpclient.methods.*; import org.apache.commons.httpclient.HttpClient; import org.apache.commons.httpclient.HttpStatus; import ...

97. HttpClient, too many open files

use below code (without using SimpleHttpConnectionManager() )and check try { static final String LOGON_SITE = ""; HttpClient client = new HttpClient(); GetMethod method = new GetMethod(LOGON_SITE); client.executeMethod(method); }catch (HttpException e) { System.err.println("Fatal protocol violation: " + e.getMessage()); e.printStackTrace(); } catch (IOException e) { System.err.println("Fatal transport error: " + e.getMessage()); e.printStackTrace(); } finally { // Release the connection. method.releaseConnection(); }

98. Problems with HTTPClient

// Provide custom retry handler is necessary method.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, new DefaultHttpMethodRetryHandler(3, false)); try { // Execute the method. int statusCode = client.executeMethod(method); if (statusCode != HttpStatus.SC_OK) { System.err.println("Method failed: " + method.getStatusLine()); } // Read the response body. byte[] responseBody = method.getResponseBody(); // Deal with the response. // Use caution: ensure correct character encoding and is not binary data System.out.println(new String(responseBody)); } ...

99. HttpClient

In a browser? You need JSP/Servlet for this. Let Servlet get the InputStream from it and write it to the OutputStream of the ServletResponse. Pretty straightforward. Take account with relative links in the HTML source of the stream. They need to be fixed as well, otherwise they become relative to the URL of your Servlet. In this case you need to ...  | Contact Us | Privacy Policy
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