UpdateSizeConstraintSet
Note
Deprecation notice: AWS WAF Classic support will end on September 30, 2025.
This is AWS WAF Classic documentation. For more information, see AWS WAF Classic in the developer guide.
For the latest version of AWS WAF , use the AWS WAFV2 API and see the AWS WAF Developer Guide. With the latest version, AWS WAF has a single set of endpoints for regional and global use.
Inserts or deletes SizeConstraint objects (filters) in a SizeConstraintSet. For each SizeConstraint
object,
you specify the following values:
-
Whether to insert or delete the object from the array. If you want to change a
SizeConstraintSetUpdate
object, you delete the existing object and add a new one. -
The part of a web request that you want AWS WAF to evaluate, such as the length of a query string or the length of the
User-Agent
header. -
Whether to perform any transformations on the request, such as converting it to lowercase, before checking its length. Note that transformations of the request body are not supported because the AWS resource forwards only the first
8192
bytes of your request to AWS WAF.You can only specify a single type of TextTransformation.
-
A
ComparisonOperator
used for evaluating the selected part of the request against the specifiedSize
, such as equals, greater than, less than, and so on. -
The length, in bytes, that you want AWS WAF to watch for in selected part of the request. The length is computed after applying the transformation.
For example, you can add a SizeConstraintSetUpdate
object that matches web requests in which the length of the
User-Agent
header is greater than 100 bytes. You can then configure AWS WAF to block those requests.
To create and configure a SizeConstraintSet
, perform the following steps:
-
Create a
SizeConstraintSet.
For more information, see CreateSizeConstraintSet. -
Use GetChangeToken to get the change token that you provide in the
ChangeToken
parameter of anUpdateSizeConstraintSet
request. -
Submit an
UpdateSizeConstraintSet
request to specify the part of the request that you want AWS WAF to inspect (for example, the header or the URI path) and the value that you want AWS WAF to watch for.
For more information about how to use the AWS WAF API to allow or block HTTP requests, see the AWS WAF Developer Guide.
Request Syntax
{
"ChangeToken": "string
",
"SizeConstraintSetId": "string
",
"Updates": [
{
"Action": "string
",
"SizeConstraint": {
"ComparisonOperator": "string
",
"FieldToMatch": {
"Data": "string
",
"Type": "string
"
},
"Size": number
,
"TextTransformation": "string
"
}
}
]
}
Request Parameters
For information about the parameters that are common to all actions, see Common Parameters.
The request accepts the following data in JSON format.
- ChangeToken
-
The value returned by the most recent call to GetChangeToken.
Type: String
Length Constraints: Minimum length of 1. Maximum length of 128.
Pattern:
.*\S.*
Required: Yes
- SizeConstraintSetId
-
The
SizeConstraintSetId
of the SizeConstraintSet that you want to update.SizeConstraintSetId
is returned by CreateSizeConstraintSet and by ListSizeConstraintSets.Type: String
Length Constraints: Minimum length of 1. Maximum length of 128.
Pattern:
.*\S.*
Required: Yes
- Updates
-
An array of
SizeConstraintSetUpdate
objects that you want to insert into or delete from a SizeConstraintSet. For more information, see the applicable data types:-
SizeConstraintSetUpdate: Contains
Action
andSizeConstraint
-
SizeConstraint: Contains
FieldToMatch
,TextTransformation
,ComparisonOperator
, andSize
-
FieldToMatch: Contains
Data
andType
Type: Array of SizeConstraintSetUpdate objects
Array Members: Minimum number of 1 item.
Required: Yes
-
Response Syntax
{
"ChangeToken": "string"
}
Response Elements
If the action is successful, the service sends back an HTTP 200 response.
The following data is returned in JSON format by the service.
- ChangeToken
-
The
ChangeToken
that you used to submit theUpdateSizeConstraintSet
request. You can also use this value to query the status of the request. For more information, see GetChangeTokenStatus.Type: String
Length Constraints: Minimum length of 1. Maximum length of 128.
Pattern:
.*\S.*
Errors
For information about the errors that are common to all actions, see Common Errors.
- WAFInternalErrorException
-
The operation failed because of a system problem, even though the request was valid. Retry your request.
HTTP Status Code: 500
- WAFInvalidAccountException
-
The operation failed because you tried to create, update, or delete an object by using an invalid account identifier.
HTTP Status Code: 400
- WAFInvalidOperationException
-
The operation failed because there was nothing to do. For example:
-
You tried to remove a
Rule
from aWebACL
, but theRule
isn't in the specifiedWebACL
. -
You tried to remove an IP address from an
IPSet
, but the IP address isn't in the specifiedIPSet
. -
You tried to remove a
ByteMatchTuple
from aByteMatchSet
, but theByteMatchTuple
isn't in the specifiedWebACL
. -
You tried to add a
Rule
to aWebACL
, but theRule
already exists in the specifiedWebACL
. -
You tried to add a
ByteMatchTuple
to aByteMatchSet
, but theByteMatchTuple
already exists in the specifiedWebACL
.
HTTP Status Code: 400
-
- WAFInvalidParameterException
-
The operation failed because AWS WAF didn't recognize a parameter in the request. For example:
-
You specified an invalid parameter name.
-
You specified an invalid value.
-
You tried to update an object (
ByteMatchSet
,IPSet
,Rule
, orWebACL
) using an action other thanINSERT
orDELETE
. -
You tried to create a
WebACL
with aDefaultAction
Type
other thanALLOW
,BLOCK
, orCOUNT
. -
You tried to create a
RateBasedRule
with aRateKey
value other thanIP
. -
You tried to update a
WebACL
with aWafAction
Type
other thanALLOW
,BLOCK
, orCOUNT
. -
You tried to update a
ByteMatchSet
with aFieldToMatch
Type
other than HEADER, METHOD, QUERY_STRING, URI, or BODY. -
You tried to update a
ByteMatchSet
with aField
ofHEADER
but no value forData
. -
Your request references an ARN that is malformed, or corresponds to a resource with which a web ACL cannot be associated.
HTTP Status Code: 400
-
- WAFLimitsExceededException
-
The operation exceeds a resource limit, for example, the maximum number of
WebACL
objects that you can create for an AWS account. For more information, see AWS WAF Classic quotas in the AWS WAF Developer Guide.HTTP Status Code: 400
- WAFNonexistentContainerException
-
The operation failed because you tried to add an object to or delete an object from another object that doesn't exist. For example:
-
You tried to add a
Rule
to or delete aRule
from aWebACL
that doesn't exist. -
You tried to add a
ByteMatchSet
to or delete aByteMatchSet
from aRule
that doesn't exist. -
You tried to add an IP address to or delete an IP address from an
IPSet
that doesn't exist. -
You tried to add a
ByteMatchTuple
to or delete aByteMatchTuple
from aByteMatchSet
that doesn't exist.
HTTP Status Code: 400
-
- WAFNonexistentItemException
-
The operation failed because the referenced object doesn't exist.
HTTP Status Code: 400
- WAFReferencedItemException
-
The operation failed because you tried to delete an object that is still in use. For example:
-
You tried to delete a
ByteMatchSet
that is still referenced by aRule
. -
You tried to delete a
Rule
that is still referenced by aWebACL
.
HTTP Status Code: 400
-
- WAFStaleDataException
-
The operation failed because you tried to create, update, or delete an object by using a change token that has already been used.
HTTP Status Code: 400
See Also
For more information about using this API in one of the language-specific AWS SDKs, see the following: