This directive can be used instead of the compile-time setting SECURITYHOLEPASSAUTHORIZATION which has been available in previous versions of Apache HTTP Server. The setting is respected by any modules which use apaddcommonvars, such as modcgi, modcgid, modproxyfcgi, modproxyscgi, and so on. RFC 1945 (HTTP 1.0) and RFC 2616 (HTTP 1.1) specify that the end-of-line marker is a carriage return character ( r) followed by a newline character ( ). Pressing Enter on a Linux host will include just a newline, so this will be a bad HTTP request. A 408 Request Timeout message is an HTTP status code that is returned to the client when a request to the server takes longer than the server's allocated timeout window. In this case, the server will terminate the connection if it is idle and thus return the 408 Request Timeout message. How is a 408 error different from a 504 error?
part of Hypertext Transfer Protocol -- HTTP/1.1RFC 2616 Fielding, et al.
10 Status Code Definitions
Each Status-Code is described below, including a description of which method(s) it can follow and any metainformation required in the response.
10.1 Informational 1xx
This class of status code indicates a provisional response, consisting only of the Status-Line and optional headers, and is terminated by an empty line. There are no required headers for this class of status code. Since HTTP/1.0 did not define any 1xx status codes, servers MUST NOT send a 1xx response to an HTTP/1.0 client except under experimental conditions.
A client MUST be prepared to accept one or more 1xx status responses prior to a regular response, even if the client does not expect a 100 (Continue) status message. Unexpected 1xx status responses MAY be ignored by a user agent.
Proxies MUST forward 1xx responses, unless the connection between the proxy and its client has been closed, or unless the proxy itself requested the generation of the 1xx response. (For example, if a
proxy adds a 'Expect: 100-continue' field when it forwards a request, then it need not forward the corresponding 100 (Continue) response(s).)
10.1.1 100 Continue
The client SHOULD continue with its request. This interim response is used to inform the client that the initial part of the request has been received and has not yet been rejected by the server. The client SHOULD continue by sending the remainder of the request or, if the request has already been completed, ignore this response. The server MUST send a final response after the request has been completed. See section 8.2.3 for detailed discussion of the use and handling of this status code.
10.1.2 101 Switching Protocols
The server understands and is willing to comply with the client's request, via the Upgrade message header field (section 14.42), for a change in the application protocol being used on this connection. The server will switch protocols to those defined by the response's Upgrade header field immediately after the empty line which terminates the 101 response.
The protocol SHOULD be switched only when it is advantageous to do so. For example, switching to a newer version of HTTP is advantageous over older versions, and switching to a real-time, synchronous protocol might be advantageous when delivering resources that use such features.
10.2 Successful 2xx
This class of status code indicates that the client's request was successfully received, understood, and accepted.
10.2.1 200 OK
The request has succeeded. The information returned with the response is dependent on the method used in the request, for example:
GET an entity corresponding to the requested resource is sent in the response; Project zomboid crack.
HEAD the entity-header fields corresponding to the requested resource are sent in the response without any message-body;
POST an entity describing or containing the result of the action;
TRACE an entity containing the request message as received by the end server.
10.2.2 201 Created
The request has been fulfilled and resulted in a new resource being created. The newly created resource can be referenced by the URI(s) returned in the entity of the response, with the most specific URI for the resource given by a Location header field. The response SHOULD include an entity containing a list of resource characteristics and location(s) from which the user or user agent can choose the one most appropriate. The entity format is specified by the media type given in the Content-Type header field. The origin server MUST create the resource before returning the 201 status code. If the action cannot be carried out immediately, the server SHOULD respond with 202 (Accepted) response instead.
A 201 response MAY contain an ETag response header field indicating the current value of the entity tag for the requested variant just created, see section 14.19.
10.2.3 202 Accepted
The request has been accepted for processing, but the processing has not been completed. The request might or might not eventually be acted upon, as it might be disallowed when processing actually takes place. There is no facility for re-sending a status code from an asynchronous operation such as this.
The 202 response is intentionally non-committal. Its purpose is to allow a server to accept a request for some other process (perhaps a batch-oriented process that is only run once per day) without requiring that the user agent's connection to the server persist until the process is completed. The entity returned with this response SHOULD include an indication of the request's current status and either a pointer to a status monitor or some estimate of when the user can expect the request to be fulfilled.
10.2.4 203 Non-Authoritative Information
The returned metainformation in the entity-header is not the definitive set as available from the origin server, but is gathered from a local or a third-party copy. The set presented MAY be a subset or superset of the original version. For example, including local annotation information about the resource might result in a superset of the metainformation known by the origin server. Use of this response code is not required and is only appropriate when the response would otherwise be 200 (OK).
10.2.5 204 No Content
The server has fulfilled the request but does not need to return an entity-body, and might want to return updated metainformation. The response MAY include new or updated metainformation in the form of entity-headers, which if present SHOULD be associated with the requested variant.
If the client is a user agent, it SHOULD NOT change its document view from that which caused the request to be sent. This response is primarily intended to allow input for actions to take place without causing a change to the user agent's active document view, although any new or updated metainformation SHOULD be applied to the document currently in the user agent's active view.
The 204 response MUST NOT include a message-body, and thus is always terminated by the first empty line after the header fields.
10.2.6 205 Reset Content
The server has fulfilled the request and the user agent SHOULD reset the document view which caused the request to be sent. This response is primarily intended to allow input for actions to take place via user input, followed by a clearing of the form in which the input is given so that the user can easily initiate another input action. The response MUST NOT include an entity.
10.2.7 206 Partial Content
The server has fulfilled the partial GET request for the resource. The request MUST have included a Range header field (section 14.35) indicating the desired range, and MAY have included an If-Range header field (section 14.27) to make the request conditional.
The response MUST include the following header fields:
If the 206 response is the result of an If-Range request that used a strong cache validator (see section 13.3.3), the response SHOULD NOT include other entity-headers. If the response is the result of an If-Range request that used a weak validator, the response MUST NOT include other entity-headers; this prevents inconsistencies between cached entity-bodies and updated headers. Otherwise, the response MUST include all of the entity-headers that would have been returned with a 200 (OK) response to the same request.
A cache MUST NOT combine a 206 response with other previously cached content if the ETag or Last-Modified headers do not match exactly, see 13.5.4.
A cache that does not support the Range and Content-Range headers MUST NOT cache 206 (Partial) responses.
10.3 Redirection 3xx
This class of status code indicates that further action needs to be taken by the user agent in order to fulfill the request. The action required MAY be carried out by the user agent without interaction with the user if and only if the method used in the second request is GET or HEAD. A client SHOULD detect infinite redirection loops, since such loops generate network traffic for each redirection.
10.3.1 300 Multiple Choices
The requested resource corresponds to any one of a set of representations, each with its own specific location, and agent- driven negotiation information (section 12) is being provided so that the user (or user agent) can select a preferred representation and redirect its request to that location.
Unless it was a HEAD request, the response SHOULD include an entity containing a list of resource characteristics and location(s) from which the user or user agent can choose the one most appropriate. The entity format is specified by the media type given in the Content- Type header field. Depending upon the format and the capabilities of
the user agent, selection of the most appropriate choice MAY be performed automatically. However, this specification does not define any standard for such automatic selection.
If the server has a preferred choice of representation, it SHOULD include the specific URI for that representation in the Location field; user agents MAY use the Location field value for automatic redirection. This response is cacheable unless indicated otherwise.
10.3.2 301 Moved Permanently
The requested resource has been assigned a new permanent URI and any future references to this resource SHOULD use one of the returned URIs. Clients with link editing capabilities ought to automatically re-link references to the Request-URI to one or more of the new references returned by the server, where possible. This response is cacheable unless indicated otherwise.
The new permanent URI SHOULD be given by the Location field in the response. Unless the request method was HEAD, the entity of the response SHOULD contain a short hypertext note with a hyperlink to the new URI(s).
If the 301 status code is received in response to a request other than GET or HEAD, the user agent MUST NOT automatically redirect the request unless it can be confirmed by the user, since this might change the conditions under which the request was issued.
10.3.3 302 Found
The requested resource resides temporarily under a different URI. Since the redirection might be altered on occasion, the client SHOULD continue to use the Request-URI for future requests. This response is only cacheable if indicated by a Cache-Control or Expires header field.
The temporary URI SHOULD be given by the Location field in the response. Unless the request method was HEAD, the entity of the response SHOULD contain a short hypertext note with a hyperlink to the new URI(s).
If the 302 status code is received in response to a request other than GET or HEAD, the user agent MUST NOT automatically redirect the request unless it can be confirmed by the user, since this might change the conditions under which the request was issued.
![2.4 2.4](/uploads/1/1/7/8/117849604/149705337.jpg)
10.3.4 303 See Other
The response to the request can be found under a different URI and SHOULD be retrieved using a GET method on that resource. This method exists primarily to allow the output of a POST-activated script to redirect the user agent to a selected resource. The new URI is not a substitute reference for the originally requested resource. The 303 response MUST NOT be cached, but the response to the second (redirected) request might be cacheable.
The different URI SHOULD be given by the Location field in the response. Unless the request method was HEAD, the entity of the response SHOULD contain a short hypertext note with a hyperlink to the new URI(s).
10.3.5 304 Not Modified
If the client has performed a conditional GET request and access is allowed, but the document has not been modified, the server SHOULD respond with this status code. The 304 response MUST NOT contain a message-body, and thus is always terminated by the first empty line after the header fields.
The response MUST include the following header fields:
If a clockless origin server obeys these rules, and proxies and clients add their own Date to any response received without one (as already specified by [RFC 2068], section 14.19), caches will operate correctly.
If the conditional GET used a strong cache validator (see section 13.3.3), the response SHOULD NOT include other entity-headers. Otherwise (i.e., the conditional GET used a weak validator), the response MUST NOT include other entity-headers; this prevents inconsistencies between cached entity-bodies and updated headers.
If a 304 response indicates an entity not currently cached, then the cache MUST disregard the response and repeat the request without the conditional.
If a cache uses a received 304 response to update a cache entry, the cache MUST update the entry to reflect any new field values given in the response.
10.3.6 305 Use Proxy
The requested resource MUST be accessed through the proxy given by the Location field. The Location field gives the URI of the proxy. The recipient is expected to repeat this single request via the proxy. 305 responses MUST only be generated by origin servers.
10.3.7 306 (Unused)
The 306 status code was used in a previous version of the specification, is no longer used, and the code is reserved.
10.3.8 307 Temporary Redirect
The requested resource resides temporarily under a different URI. Since the redirection MAY be altered on occasion, the client SHOULD continue to use the Request-URI for future requests. This response is only cacheable if indicated by a Cache-Control or Expires header field.
The temporary URI SHOULD be given by the Location field in the response. Unless the request method was HEAD, the entity of the response SHOULD contain a short hypertext note with a hyperlink to the new URI(s) , since many pre-HTTP/1.1 user agents do not understand the 307 status. Therefore, the note SHOULD contain the information necessary for a user to repeat the original request on the new URI.
If the 307 status code is received in response to a request other than GET or HEAD, the user agent MUST NOT automatically redirect the request unless it can be confirmed by the user, since this might change the conditions under which the request was issued.
10.4 Client Error 4xx
The 4xx class of status code is intended for cases in which the client seems to have erred. Except when responding to a HEAD request, the server SHOULD include an entity containing an explanation of the error situation, and whether it is a temporary or permanent condition. These status codes are applicable to any request method. User agents SHOULD display any included entity to the user.
If the client is sending data, a server implementation using TCP SHOULD be careful to ensure that the client acknowledges receipt of the packet(s) containing the response, before the server closes the input connection. If the client continues sending data to the server after the close, the server's TCP stack will send a reset packet to the client, which may erase the client's unacknowledged input buffers before they can be read and interpreted by the HTTP application.
10.4.1 400 Bad Request
The request could not be understood by the server due to malformed syntax. The client SHOULD NOT repeat the request without modifications.
10.4.2 401 Unauthorized
The request requires user authentication. The response MUST include a WWW-Authenticate header field (section 14.47) containing a challenge applicable to the requested resource. The client MAY repeat the request with a suitable Authorization header field (section 14.8). If the request already included Authorization credentials, then the 401 response indicates that authorization has been refused for those credentials. If the 401 response contains the same challenge as the prior response, and the user agent has already attempted authentication at least once, then the user SHOULD be presented the entity that was given in the response, since that entity might include relevant diagnostic information. HTTP access authentication is explained in 'HTTP Authentication: Basic and Digest Access Authentication' [43].
10.4.3 402 Payment Required
This code is reserved for future use.
10.4.4 403 Forbidden
The server understood the request, but is refusing to fulfill it. Authorization will not help and the request SHOULD NOT be repeated. If the request method was not HEAD and the server wishes to make public why the request has not been fulfilled, it SHOULD describe the reason for the refusal in the entity. If the server does not wish to make this information available to the client, the status code 404 (Not Found) can be used instead.
10.4.5 404 Not Found
The server has not found anything matching the Request-URI. No indication is given of whether the condition is temporary or permanent. The 410 (Gone) status code SHOULD be used if the server knows, through some internally configurable mechanism, that an old resource is permanently unavailable and has no forwarding address. This status code is commonly used when the server does not wish to reveal exactly why the request has been refused, or when no other response is applicable.
10.4.6 405 Method Not Allowed
The method specified in the Request-Line is not allowed for the resource identified by the Request-URI. The response MUST include an Allow header containing a list of valid methods for the requested resource.
10.4.7 406 Not Acceptable
The resource identified by the request is only capable of generating response entities which have content characteristics not acceptable according to the accept headers sent in the request.
Unless it was a HEAD request, the response SHOULD include an entity containing a list of available entity characteristics and location(s) from which the user or user agent can choose the one most appropriate. The entity format is specified by the media type given in the Content-Type header field. Depending upon the format and the capabilities of the user agent, selection of the most appropriate choice MAY be performed automatically. However, this specification does not define any standard for such automatic selection.
If the response could be unacceptable, a user agent SHOULD temporarily stop receipt of more data and query the user for a decision on further actions.
10.4.8 407 Proxy Authentication Required
This code is similar to 401 (Unauthorized), but indicates that the client must first authenticate itself with the proxy. The proxy MUST return a Proxy-Authenticate header field (section 14.33) containing a challenge applicable to the proxy for the requested resource. The client MAY repeat the request with a suitable Proxy-Authorization header field (section 14.34). HTTP access authentication is explained in 'HTTP Authentication: Basic and Digest Access Authentication' [43].
10.4.9 408 Request Timeout
The client did not produce a request within the time that the server was prepared to wait. The client MAY repeat the request without modifications at any later time.
10.4.10 409 Conflict
The request could not be completed due to a conflict with the current state of the resource. This code is only allowed in situations where it is expected that the user might be able to resolve the conflict and resubmit the request. The response body SHOULD include enough
information for the user to recognize the source of the conflict. Ideally, the response entity would include enough information for the user or user agent to fix the problem; however, that might not be possible and is not required.
Conflicts are most likely to occur in response to a PUT request. For example, if versioning were being used and the entity being PUT included changes to a resource which conflict with those made by an earlier (third-party) request, the server might use the 409 response to indicate that it can't complete the request. In this case, the response entity would likely contain a list of the differences between the two versions in a format defined by the response Content-Type.
10.4.11 410 Gone
The requested resource is no longer available at the server and no forwarding address is known. This condition is expected to be considered permanent. Clients with link editing capabilities SHOULD delete references to the Request-URI after user approval. If the server does not know, or has no facility to determine, whether or not the condition is permanent, the status code 404 (Not Found) SHOULD be used instead. This response is cacheable unless indicated otherwise.
The 410 response is primarily intended to assist the task of web maintenance by notifying the recipient that the resource is intentionally unavailable and that the server owners desire that remote links to that resource be removed. Such an event is common for limited-time, promotional services and for resources belonging to individuals no longer working at the server's site. It is not necessary to mark all permanently unavailable resources as 'gone' or to keep the mark for any length of time -- that is left to the discretion of the server owner.
10.4.12 411 Length Required
The server refuses to accept the request without a defined Content- Length. The client MAY repeat the request if it adds a valid Content-Length header field containing the length of the message-body in the request message.
10.4.13 412 Precondition Failed
The precondition given in one or more of the request-header fields evaluated to false when it was tested on the server. This response code allows the client to place preconditions on the current resource metainformation (header field data) and thus prevent the requested method from being applied to a resource other than the one intended.
10.4.14 413 Request Entity Too Large
The server is refusing to process a request because the request entity is larger than the server is willing or able to process. The server MAY close the connection to prevent the client from continuing the request.
If the condition is temporary, the server SHOULD include a Retry- After header field to indicate that it is temporary and after what time the client MAY try again.
10.4.15 414 Request-URI Too Long
The server is refusing to service the request because the Request-URI is longer than the server is willing to interpret. This rare condition is only likely to occur when a client has improperly converted a POST request to a GET request with long query information, when the client has descended into a URI 'black hole' of redirection (e.g., a redirected URI prefix that points to a suffix of itself), or when the server is under attack by a client attempting to exploit security holes present in some servers using fixed-length buffers for reading or manipulating the Request-URI.
10.4.16 415 Unsupported Media Type
The server is refusing to service the request because the entity of the request is in a format not supported by the requested resource for the requested method.
10.4.17 416 Requested Range Not Satisfiable
A server SHOULD return a response with this status code if a request included a Range request-header field (section 14.35), and none of the range-specifier values in this field overlap the current extent of the selected resource, and the request did not include an If-Range request-header field. (For byte-ranges, this means that the first- byte-pos of all of the byte-range-spec values were greater than the current length of the selected resource.)
When this status code is returned for a byte-range request, the response SHOULD include a Content-Range entity-header field specifying the current length of the selected resource (see section 14.16). This response MUST NOT use the multipart/byteranges content- type.
10.4.18 417 Expectation Failed
The expectation given in an Expect request-header field (see section 14.20) could not be met by this server, or, if the server is a proxy, the server has unambiguous evidence that the request could not be met by the next-hop server.
10.5 Server Error 5xx
Response status codes beginning with the digit '5' indicate cases in which the server is aware that it has erred or is incapable of performing the request. Except when responding to a HEAD request, the server SHOULD include an entity containing an explanation of the error situation, and whether it is a temporary or permanent condition. User agents SHOULD display any included entity to the user. These response codes are applicable to any request method.
10.5.1 500 Internal Server Error
The server encountered an unexpected condition which prevented it from fulfilling the request.
10.5.2 501 Not Implemented
Http 408 Apache
The server does not support the functionality required to fulfill the request. This is the appropriate response when the server does not recognize the request method and is not capable of supporting it for any resource.
10.5.3 502 Bad Gateway
The server, while acting as a gateway or proxy, received an invalid response from the upstream server it accessed in attempting to fulfill the request.
10.5.4 503 Service Unavailable
The server is currently unable to handle the 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. If known, the length of the delay MAY be indicated in a Retry-After header. If no Retry-After is given, the client SHOULD handle the response as it would for a 500 response.
10.5.5 504 Gateway Timeout
The server, while acting as a gateway or proxy, did not receive a timely response from the upstream server specified by the URI (e.g. HTTP, FTP, LDAP) or some other auxiliary server (e.g. DNS) it needed to access in attempting to complete the request.
10.5.6 505 HTTP Version Not Supported
The server does not support, or refuses to support, the HTTP protocol version that was used in the request message. The server is indicating that it is unable or unwilling to complete the request using the same major version as the client, as described in section 3.1, other than with this error message. The response SHOULD contain an entity describing why that version is not supported and what other protocols are supported by that server.
The 408 Request Timeout is an
HTTP response status code
indicating that the server did not receive a complete request from the client within the server’s allotted timeout period. The 408 Request Timeout
error code appears similar to the 504 Gateway Timeout
error we explored in a previous article, which indicates that that a server acting as a gateway or proxy timed out. However, the 408 Request Timeout
error isn’t a message from a gateway or proxy server somewhere in the node chain, but is a direct message from the active server the client has connected to (like a the web server)It can be difficult to find the cause of unexpected HTTP response codes and the
408 Request Timeout
error code is no exception. With a potential pool of over 50 status codes used to represent the complex relationship between the client, a web application, a web server, and (possibly) multiple third-party web services, determining the cause of a particular status code can be challenging, even under the best of circumstances.![Http Http](/uploads/1/1/7/8/117849604/536841825.png)
In this article we’ll explore the
408 Request Timeout
in greater depth by looking at what might cause this message to appear, including a few tips you can use to diagnose and debug the appearance of this error within your own application. We’ll even look at a number of the most popular content management systems (CMSs
) for potential problem areas that could cause your own website to be unexpectedly generating 408 Request Timeout
errors. Let’s dive right in!Server- or Client-Side?
All HTTP response status codes within the
4xx
category are considered client error responses
. Errors in the 4xx
category contrast with those from the 5xx
category, such as the aforementioned 504 Gateway Timeout
we examined earlier, which are considered server error responses
. That said, the appearance of a 4xx
error doesn’t necessarily mean the issue is on the client side (the “client”, in this case, is typically the web browser or device being used to access the application). Oftentimes, if you’re trying to diagnose an issue within your own application, you can immediately ignore most client-side code and components, such as HTML, cascading style sheets (CSS), client-side JavaScript, and so forth. This doesn’t apply solely to web sites, either. Smart phone applications often implement modern looking user interfaces that are actually powered by normal web applications behind the scenes.On the other hand, the server could be the root cause of a
408 Request Timeout
error. In some cases, the server may be misconfigured and may be handling requests improperly, which can result in 408
code responses and other troublesome traffic routing issues. We’ll explore some of these scenarios (and potential solutions) down below, but be aware that, even though the 408 Request Timeout
is considered a client error response
, it doesn’t necessarily mean we can rule out either the client nor the server as the culprit in this scenario. In these situations, the server
is still the network object that is producing the 408 Request Timeout
and returning it as the HTTP response code to the client
, but it could be that the client is causing the issue in some way.Start With a Thorough Application Backup
As usual, it is better to have played it safe at the start than to screw something up and come to regret it later on down the road. As such, it is critical that you perform a full backup of your application, database, and all other components of your website or application before attempting any fixes or changes to the system. Even better, if you have the capability, create a complete copy of the application and stick the copy on a secondary
staging
server that is either inactive, or publicly inaccessible. This will give you a clean testing ground on which to test all potential fixes needed to resolve the issue, without threatening the security or sanctity of your live application.Diagnosing a 408 Request Timeout
A
408 Request Timeout
response code indicates that the server did not receive a complete request from the client within a specific period of time tracked by the server (i.e. the timeout
period). As specified in the RFC7235 HTTP/1.1 Semantics and Content standards document server should include the special Connection
header with the close
directive as part of its response (e.g. Connection: close
), which informs the client that the connection should be closed. Put simply, a 408
code informs the client that the server has decided to close the connection rather than continue waiting for the transaction to complete. Upon receiving the Connection: close
header the client can opt to repeat the original request using a new connection.Most modern browsers implement HTTP preconnection mechanisms, which provides the user agent (i.e. browser) to speed up overall web surfing experiences by essentially predicting what resources — and therefore connections — the client may be using in the immediate future. The full scope of how browsers use these mechanisms is well beyond the scope of this article, but you can check out the W3C Resource Hints documentation for more details.
Troubleshooting on the Client-Side
Since the
408 Request Timeout
is a client error response
code, it’s best to start by troubleshooting any potential client-side issues that could be causing this error. Here are a handful of tips to try on the browser or device that is giving you problems.Check the Requested URL
The most common cause of a
408 Request Timeout
is simply inputting an incorrect URL. Many servers are tightly secured, so as to disallow unexpected requests to resources that a client/user agent should not have access to. It may be that the requested URL is slightly incorrect, which is causing the user agent to request an unintended resource, which may be routed through a proxy server that requires authentication. For example, a request to the URI https://airbrake.io/login
might route requests through a separate proxy server used to handle user authentication. If the original request did not contain appropriate credentials, the result could be a 408 Request Timeout
error response. It’s always a good idea to double-check the exact URL that is returning the 408 Request Timeout
error to make sure it is intended resource.Debugging Common Platforms
If you’re running common software packages on the server that is responding with the
408 Request Timeout
, you may want to start by looking into the stability and functionality of those platforms first. Viscera cleanup detail mac download. The most common content management systems — like WordPress, Joomla!, and Drupal — are all typically well-tested out of the box, but once you start making modifications to the underlying extensions or PHP
code (the language in which nearly all modern content management systems are written in), it’s all too easy to cause an unforeseen issue that results in a 408 Request Timeout
.There are a few tips below aimed at helping you troubleshoot some of these popular software platforms.
Rollback Recent Upgrades
If you recently updated the content management system itself just before the
408 Request Timeout
appeared, you may want to consider rolling back to the previous version you had installed when things were working fine. Similarly, any extensions or modules that you may have recently upgraded can also cause server-side issues, so reverting to previous versions of those may also help. For assistance with this task, simply Google “downgrade [PLATFORM_NAME]” and follow along. In some cases, however, certain CMSs don’t really provide a version downgrade capability, which indicates that they consider the base application, along with each new version released, to be extremely stable and bug-free. This is typically the case for the more popular platforms, so don’t be afraid if you can’t find an easy way to revert the platform to an older version.Uninstall New Extensions, Modules, or Plugins
Depending on the particular content management system your application is using, the exact name of these components will be different, but they serve the same purpose across every system: improving the capabilities and features of the platform beyond what it’s normally capable of out of the box. But be warned: such extensions can, more or less, take full control of the system and make virtually any changes, whether it be to the
PHP
code, HTML, CSS, JavaScript, or database. As such, it may be wise to uninstall any new extensions that may have been recently added. Again, Google the extension name for the official documentation and assistance with this process.Check for Unexpected Database Changes
It’s worth noting that, even if you uninstall an extension through the CMS dashboard, this doesn’t guarantee that changes made by the extension have been fully reverted. This is particularly true for many WordPress extensions, which are given carte blanche within the application, including full access rights to the database. Unless the extension author explicitly codes such things in, there are scenarios where an extension may modify database records that don’t “belong” to the extension itself, but are instead created and managed by other extensions (or even the base CMS itself). In those scenarios, the extension may not know how to revert alterations to database records, so it will ignore such things during uninstallation. Diagnosing such problems can be tricky, but I’ve personally encountered such scenarios multiple times, so your best course of action, assuming you’re reasonably convinced an extension is the likely culprit for the
408 Request Timeout
, is to open the database and manually look through tables and records that were likely modified by the extension.Above all, don’t be afraid to Google your issue. Try searching for specific terms related to your issue, such as the name of your application’s CMS, along with the
408 Request Timeout
. Chances are you’ll find someone who has experienced the same issue.Troubleshooting on the Server-Side
If you aren’t running a CMS application — or even if you are, but you’re confident the
408 Request Timeout
isn’t related to that — here are some additional tips to help you troubleshoot what might be causing the issue on the server-side of things.Confirm Your Server Configuration
Your application is likely running on a server that is using one of the two most popular web server softwares,
Apache
or nginx
. At the time of publication, both of these web servers make up 84% of the world’s web server software! Thus, one of the first steps you can take to determine what might be causing these 408 Request Timeout
response codes is to check the configuration files for your web server software for unintentional redirect or request handling instructions.To determine which web server your application is using you’ll want to look for a key file. If your web server is Apache then look for an
.htaccess
file within the root directory of your website file system. For example, if your application is on a shared host you’ll likely have a username associated with the hosting account. In such a case, the application root directory is typically found at the path of /home/<username>/public_html/
, so the .htaccess
file would be at /home/<username>/public_html/.htaccess
.If you located the
.htaccess
file then open it in a text editor and look for lines that use KeepAliveTimeout
or RequestReadTimeout
directives. KeepAliveTimeout
is part of the core
module, while RequestReadTimeout
is from the reqtimeout
module in Apache. Covering exactly how these directives work is well beyond the scope of this article, however, the basic concept is that these timeout directives inform the server to allow for incoming client requests to take only a certain amount of time before they are considered failed and closed via a 408
response.Http Error 408 Apache
For example, here we’re using the
RequestReadTimeout
directive to set header and body timeouts of 15
and 30
seconds:Look for any strange timeout directives in the
.htaccess
file that don’t seem to belong, then try temporarily commenting them out (using the #
character prefix) and restarting your web server to see if this resolves the issue.On the other hand, if your server is running on
nginx
, you’ll need to look for a completely different configuration file. By default this file is named nginx.conf
and is located in one of a few common directories: /usr/local/nginx/conf
, /etc/nginx
, or /usr/local/etc/nginx
. Once located, open nginx.conf
in a text editor and look for client_body_timeout
, client_header_timeout
, or keepalive_timeout
directives, which are all part of the http_core
Nginx module. For example, here is a simple block directive
(i.e. a named set of directives) that configures a virtual server for airbrake.io
and sets the client header and body timeouts to 15
and 30
seconds, respectively:Have a look through your
nginx.conf
file for any abnormal _timeout
directives and comment out any abnormalities before restarting the server to see if the issue was resolved.Configuration options for each different type of web server can vary dramatically, so we’ll just list a few popular ones to give you some resources to look through, depending on what type of server your application is running on:
Look Through the Logs
Nearly every web application will keep some form of server-side logs.
Application logs
are typically the history of what the application did, such as which pages were requested, which servers it connected to, which database results it provides, and so forth. Server logs
are related to the actual hardware that is running the application, and will often provide details about the health and status of all connected services, or even just the server itself. Google “logs [PLATFORM_NAME]” if you’re using a CMS, or “logs [PROGRAMMING_LANGUAGE]” and “logs [OPERATING_SYSTEM]” if you’re running a custom application, to get more information on finding the logs in question.Debug Your Application Code or Scripts
Http 408 Apache 2.4
If all else fails, it may be that a problem in some custom code within your application is causing the issue. Try to diagnose where the issue may be coming from through manually debugging your application, along with parsing through application and server logs. Ideally, make a copy of the entire application to a local development machine and perform a step-by-step debug process, which will allow you to recreate the exact scenario in which the
408 Request Timeout
occurred and view the application code at the moment something goes wrong.No matter the cause — and even if you managed to fix this particular error this time around — the appearance of an issue like the
408 Request Timeout
within your own application is a good indication you may want to implement an error management tool, which will help you automatically detect errors and will alert you the instant they occur. Airbrake’s error monitoring software provides real-time error monitoring and automatic exception reporting for all your development projects. Airbrake’s state of the art web dashboard ensures you receive round-the-clock status updates on your application’s health and error rates. No matter what you’re working on, Airbrake easily integrates with all the most popular languages and frameworks. Plus, Airbrake makes it easy to customize exception parameters, while giving you complete control of the active error filter system, so you only gather the errors that matter most.Http Error 408 Apache
Check out Airbrake’s error monitoring software today and see for yourself why so many of the world’s best engineering teams use Airbrake to revolutionize their exception handling practices!