Page 15 :HTTP Error 400 Bad request

Introduction

The Web server (running the Web site) thinks that the data stream sent by the client  was 'malformed'

i.e. did not respect the HTTP protocol completely.

So the Web server was unable to understand the request and process it.

400 errors in the HTTP cycle

Any client  goes through the following cycle:

• Obtain an IP address from the IP name of the site  This lookup (conversion of IP name to IP address) is provided by domain name servers (DNSs).
• Open an IP socket connection to that IP address.
• Write an HTTP data stream through the socket.
• Receive an HTTP data stream back from the Web server response. This data stream contains status codes whose values are determined by the HTTP protocol. Parse this data stream for status codes and other useful information.

Fixing 400 errors - general

There is a low-level problem in the client or the Web server or both. 95% of the time this is because of a problem on the client system
e.g. there is something unstable on your PC running the Web browser.

• Try to browser again in three times to make sure that error
• What has changed since you started getting the HTTP 400 problem ?. In general terms, think about what has changed on your PC since you first started seeing the problem. This may cover any of the items mentioned above.

• How stable is your Internet connection ?.You can  try to check that the Web site you are actually visiting is the one you think you are visiting. For example, you may have a DNS problem. You can check this using a ‘ping’ test. A DNS problem may be caused by your ISP or may be on your own system e.g. in a ‘hosts’ file.

• Is your PC secure ?. If your PC is not well-protected, then all kinds of problems may occur - including HTTP 400 errors. If you run Windows, stay uptodate with automatic security updates from Microsoft and possibly consider getting a registry cleaner. Always have good anti-virus and spyware protection. Invest in a hardware firewall if you can afford one. Be sensible surfing the Web - block pop-up windows and avoid bad sites. If your PC not secure then Web traffic out from your PC to the Internet may be secretly corrupted by malware (spyware, viruses, etc.).
• Are you installed web-based software ?. Some social networking and games sites ask you to download and run software on your PC so you can interact with other people on the Internet directly (without using your Web browser). This software, if badly written or even criminal, can corrupt all HTTP traffic from your PC. At bad action, you may have to reinstall your operating system again (possibly losing all your personal data on your PC if you do not have backup).may be defective. Try to find an upgrade or security fix for the problem browser. 
• If you recently changed some configuration options in the problem browser, reversing the change to see if that helps to fix this problem.
• Do you get the error on big Web sites ?. If you get the problem on quite a small site, visit some of the bigger sites like Amazon, Ebay, Google, Microsoft and Yahoo. If you get the problem only on small sites, it indicates a problem with only those sites or the traffic from your PC to those sites.
• Do you get the error on simple URLs ?. If you get a problem with a long complicated URL (such as http://www.xxx.com?PHPrequest=643&value=dres&cookies=No) but not with a shorter simpler URL for the same site (such as http://www.xxx.com), this can indicate a problem with the Web server on the site you are trying to visit. This is not conclusive evidence, but is a good starting point. Contact the owners of the Web site and describe the problem to them. You may find for example the problem occurs with POST methods (you are both submitting data to the Web site and retrieving data from the Web site), but not with GET methods (you are only retrieving data from the Web site).
• Do you have a cache problem ?. clearing your cookies, browser cache and browsing history in your Web browser. Disable or remove any third-party cache or ‘web accelerator’ software you installed. Then try rebooting your PC . If this action  not fix the error, but at least may eliminate any problem due to settings on your PC.

Page 11 : HTTP Error 405

HTTP Error 405 Method not allowed

Introduction

The HTTP protocol defines methods to indicate the action to be performed on the Web server for the particular URL resource identified by the client (e.g. your Web browser ). The methods are as follows:

• OPTIONS: Find out the communication options available for a particular URL resource. Allows the client to determine the options and/or requirements associated with a resource, or the capabilities of a server, without a specific action involving transfer of data.
• GET: Retrieve the information identified by the URL resource e.g. GET a particular Web page or image. The most common method by far.
• HEAD: Identical to GET except that the server returns header information only, not the actual information identified by the URL resource. Useful to obtain metainformation about the entity implied by the request without transferring the entity-body itself. Often used to test hypertext links for validity, accessibility, and recent modification.
• POST: Submit data to the Web server such as 1) post a message to a bulletin board, newsgroup or mailing list, 2) provide input data - typically from a CGI form - to a data-handling process, 3) add a record directly to a database.
• PUT: Set (place/replace) the data for a particular URL to the new data submitted by the client. For example, upload a new Web page to a server.
• DELETE: Remove the data associated with the URL resource. For example, delete a Web page.
• TRACE: Run a remote, application-layer loop-back of the request message. Effectively a 'ping' which tests what data the Web server is receiving from the client.
• CONNECT: Reserved for use with tunneling (e.g. SSL) via a proxy server. This method is defined only for HTTP version 1.1, not the earlier version 1.0.

All Web servers can be configured to allow or disallow any method.

405 errors in the HTTP cycle

Any client (e.g. your Web browser or our CheckUpDown robot) goes through the following cycle:

• Obtain an IP address from the IP name of the site (the site URL without the leading 'http://'). This lookup (conversion of IP name to IP address) is provided by domain name servers (DNSs).
• Open an IP socket connection to that IP address.
• Write an HTTP data stream through that socket.
• Receive an HTTP data stream back from the Web server in response. This data stream contains status codes whose values are determined by the HTTP protocol. Parse this data stream for status codes and other useful information.

This error occurs in the final step above when the client receives an HTTP status code that it recognises as '405'.

Fixing 405 errors - general

405 errors often arise with the POST method. You may be trying to introduce some kind of input form on the Web site, but not all ISPs allow the POST method necessary to process the form.
All 405 errors can be traced to configuration of the Web server and security governing access to the content of the Web site, so should easily be explained by your ISP.

Page 10: facebook error 191

 API Error Code: 191

After installing Facebook single-sign-on and trying to sign-in with your Facebook account you get this message:

API Error Description: The specified URL is not owned by the application
Error Message: redirect_uri is not owned by the application.

Why

While registering the application you had to provide the URL of the site. That URL is not the same as the URL from which you run the script and get the 191 error. You have to fix that.

Reolving General
If you specified the main URL (www.mysite.com), and the script is on sub-domain (subdomain.mysite.com) do this

• Register the app with the URL of the sub-domain.

If you specified the main URL with www (www.mysite.com) and called the script from the URL without www (mysite.com) or Vice Versa (specified without WWW and called with WWW) do this

• Call this script from same URL as specified in app settings.

Page 9 : HTTP Error 301

HTTP Error 301 - Moved permanently

Introduction

Your Web server thinks that your URL has been permanently redirected to another URL. The client system is expected to immediately retry the alternate URL.

301 errors in the HTTP cycle

Any client (e.g. your Web browser or our CheckUpDown robot) goes through the following cycle when it communicates with the Web server:

• Obtain an IP address from the IP name of the site (the site URL without the leading 'http://'). This lookup (conversion of IP name to IP address) is provided by domain name servers (DNSs).
• Open an IP socket connection to that IP address.
• Write an HTTP data stream through that socket.
• Receive an HTTP data stream back from the Web server in response. This data stream contains status codes whose values are determined by the HTTP protocol. Parse this data stream for status codes and other useful information.

This error occurs in the final step above when the client receives an HTTP status code that it recognises as '301'.

Fixing 301 errors - general

The 301 response from the Web server should always include an alternative URL to which redirection should occured

If it does, a Web browser will immediately retry the alternative URL. So you never actually see a 301 error in a Web browser, unless perhaps you have a corrupt redirection chain e.g. URL A redirects to URL B which in turn redirects back to URL A. If your client is not a Web browser, it should behave in the same way as a Web browser i.e. immediately retry the alternative URL.

If the Web server does not return an alternative URL with the 301 response, then either the Web server sofware itself is defective or the Webmaster has not set up the URL redirection correctly.

.

Page 8: HTTP Error 302

HTTP Error 302 - Moved temporarily

Introduction

Your Web server thinks that your URL has been temporarily redirected to another URL. The client system is expected to immediately retry the alternate URL.

302 errors in the HTTP cycle

Any client (e.g. your Web browser or our CheckUpDown robot) goes through the following cycle when it communicates with the Web server:

• Obtain an IP address from the IP name of the site (the site URL without the leading 'http://').
• Open an IP socket connection to that IP address.
• Write an HTTP data stream through that socket.
• Receive an HTTP data stream back from the Web server in response.

This error occurs in the final step above when the client receives an HTTP status code that it recognises as '302'.

Resolving 302 errors - general

The 302 response from the Web server should always include an alternative URL to which redirection should occur. If it does, a Web browser will immediately retry the alternative URL. So you never actually see a 302 error in a Web browser, unless perhaps you have a corrupt redirection chain e.g. URL A redirects to URL B which in turn redirects back to URL A. If your client is not a Web browser, it should behave in the same way as a Web browser i.e. immediately retry the alternative URL.
If the Web server does not return an alternative URL with the 302 response, then either the Web server sofware itself is defective or the Webmaster has not set up the URL redirection correctly.

Missing DLL or driver on Windows

Do you always send the message in the windows pop up that your program can not be run because missing the DLL file (driver file), so you can write about the missing DLL  in thatt windows message pop up. find it in the your browser and download them in your computer .
WE have suggested this website link for find your missing DLL (Nodevice.com), or you can search on your browser about "DLL driver / file"
after that you can do this step to instal on your computer

1. Uncompress the DLL downloaded file from DLL-Downloads.com to your system32 folder within the Windows folder.  [c:\WINDOWS\system32]
2. Click on the Start button, then click the Run... option
3. In the "Open" line, type the following (without quotes) "regsvr32 filename.dll" (replace filename.dll with the actual filename of the file you downloaded), then click the "OK" button.





4. If the installation was successful, you should see a message saying that your file was successfully installed/uninstalled.
   
   

Check Your Hard Disk For Errors

When using your computer regularly you need to keep up with computer maintenance and to check you hard disk drive for errors is one of those tasks. Your hard disk drive is where everything is stored on your computer so to say the hard drives performance is important is an understatement.
You can not only help solve some computer problems but you can also improve the performance of your computer by making sure that your hard disk has no errors.

1.  Open Computer by clicking the Start button , and then clicking Computer.

2.  Right-click the hard disk drive that you want to check, and then click Properties.

3. Click the Tools tab, and then, under Error-checking, click Check Now.  If you are prompted for an administrator password or confirmation, type the password or provide confirmation.

What does Windows error checking do?

To automatically repair problems with files and folders that the scan detects, select Automatically fix file system errors. Otherwise, the disk check will simply report problems but not fix them.
To perform a thorough disk check, select Scan for and attempt recovery of bad sectors. This scan attempts to find and repair physical errors on the hard disk itself, and it can take much longer to complete.
To check for both file errors and physical errors, select both Automatically fix file system errors and Scan for and attempt recovery of bad sectors.
Depending upon the size of your hard disk, this may take several minutes. For best results, don’t use your computer for any other tasks while it’s checking for errors.

Computer running too slow ..

why your computer runnng too slow...

Symptoms	Probable Causes	Solution	Find
Lack of disk space	System is bloated	Cleans up your PC from over	click on start/accesories/
General system			system tools /disc cleanup
Slow down			or you can search in
	with junk files.	70 different types of junk files.	your browser disc clean up
Slow program start-ups	Files and free space	Defragments and	Click on start/accessories/
		re-arranges files to	system tool/disc defragment
		ensure the most	or you can search in
Poor responsiveness	are fragmented.	efficient file placement.	browser disc defragment
System errors	Windows registry	Cleans up obsolete	You can find in your browser
Random program failures	contains obsolete	records, fixes corrupt	"registry fix program download"
	or corrupt records.	references and	copy and installed, run it.
		defragments the registry.
Windows takes too long to load	Various programs set	Allows you to	Click on start/start up menus
	themselves to start	disable programs	you can able
	on boot automatically.	from starting up	or
		when your PC boots.	disable the program
Slow Internet browsing	Windows uses preset	Optimizes Windows	Click on start/ control panel/
and download speed	settings that are not	settings specifically	internet connection /
	optimized for	for the type of Internet	then delete cookies
	your connection type.	connection you use.	or clean history

Page 2:HTTP Error 503 - Service unavailable

HTTP Error 503 - Service unavailable

Introduction

The Web server (running the Web site) is currently unable to handle the HTTP request due to a temporary overloading or maintenance of the server. The implication is that this is a temporary condition which will be alleviated after some delay. Some servers in this state may also simply refuse the socket connection, in which case a different error may be generated because the socket creation timed out.

503 errors in the HTTP cycle

Any client (e.g. your Web browser or our CheckUpDown robot) goes through the following cycle when it communicates with the Web server:

• Obtain an IP address from the IP name of the site (the site URL without the leading 'http://'). This lookup (conversion of IP name to IP address) is provided by domain name servers (DNSs).
• Open an IP socket connection to that IP address.
• Write an HTTP data stream through that socket.
• Receive an HTTP data stream back from the Web server in response. This data stream contains status codes whose values are determined by the HTTP protocol. Parse this data stream for status codes and other useful information.

This error occurs in the final step above when the client receives an HTTP status code that it recognises as '503'. Frank Vipond. September 2010.

Fixing 503 errors

The Web server is effectively 'closed for repair'. It is still functioning minimally because it can at least respond with a 503 status code, but full service is impossible i.e. the Web site is simply unavailable. There are a myriad possible reasons for this, but generally it is because of some human intervention by the operators of the Web server machine. You can usually expect that someone is working on the problem, and normal service will resume as soon as possible.
Please contact the system operators of the Web site (e.g. your ISP) to determine why the service is down. They will be in a much better position to help you than we are for this type of error.

<<<Page1 | Page3>>>