Advanced settings for HTTP monitors

Advanced settings for HTTP monitors enable you to define several timeout and size values to fine-tune HTTP monitor execution. Advanced settings are available in edit mode after HTTP monitor creation and apply to all requests in your monitor.

Turn on Enable advanced settings on the Advanced settings tab to specify custom values. If you select Use defaults > Apply, the toggle is turned off (and any custom threshold values you set up are replaced by defaults).

Notes on thresholds

Hints on input format are displayed in each field. The accepted ranges and default values are displayed below each field. Defaults apply when no custom value is specified or if the advanced settings toggle is turned off.

  • In fields for timeout values:
    • Entering a numeral without a unit is understood as milliseconds. Do not use commas in numerals.
    • Use ms, s, or min as applicable to specify units; do not use capital letters.
  • If a timeout threshold is breached, for example, if monitor execution time is greater than the timeout specified, the HTTP monitor fails.
  • In fields for size values:
    • Entering a numeral without a unit is understood as bytes, where 1024 B = 1 kB and 1048576 B = 1 MB.
    • Use B, kB, or MB as applicable to specify units; do not use b or KB.
Field
Description
Range
Default
Input format

Request timeout

Time within which each request must be completed and the response received—this includes the time taken for DNS lookup, establishing a TCP/TLS connection, sending requests, and receiving responses.

1000 ms (1 s)–60000 ms (1 min)

10000 ms (10 s)

For example: 60000 ms, 60000ms, 60 s, 60s, 1 min, 1min

Connect timeout per request

Time within which a TCP/TLS connection for each request must be established—in the case of HTTPS requests, this includes the TLS handshake, negotiating a cipher with the server, analyzing certificates, and all other parts of the TLS protocol.

1000 ms (1 s)–60000 ms (1 min)

5000 ms (5 s)

For example: 60000 ms, 60000ms, 60 s, 60s, 1 min, 1min

Monitor execution timeout

Time within which monitor execution must be completed—this is the response time for the sum of all requests.

10000 ms (10 s)–300000 ms (5 min)

60000 ms (60 s)

For example: 60000 ms, 60000ms, 60 s, 60s, 1 min, 1min

Pre- or post-execution script timeout

Maximum duration of a request's pre-execution or post-execution script

1000 ms (1 s)–10000 ms (10 s)

1000 ms (1 s)

For example: 1000 ms, 1000ms, 1 s, 1s

DNS query timeout per request

Maximum duration of a DNS lookup for resolving a hostname for each request

Make sure that the DNS query timeout per request is not greater than the request timeout divided by the number of DNS servers. If a DNS query times out against one server, the Synthetic engine queries other available servers.

For example, if the request timeout is 30 s and there are three DNS servers, the DNS timeout should not be greater than 30 / 3 = 10 s.

1000 ms (1 s)–60000 ms (1 min)

5000 ms (5 s)

For example: 60000 ms, 60000ms, 60 s, 60s, 1 min, 1min

Maximum size of each request header

Maximum number of bytes per HTTP request header—if a header is larger, it is truncated.

10240 B (10 kB)–61440 B (60 kB)

50000 B

For example: 10240 B, 10240B, 10 kB, 10kB

Maximum request body size

Maximum number of bytes for an HTTP POST payload (request body)—if the payload is larger, it is truncated.

10240 B (10 kB)–102400 B (100 kB)

50000 B

For example: 10240 B, 10240B, 10 kB, 10kB

Maximum size of each pre-execution or post-execution script

Maximum number of bytes per pre-execution or post-execution script—if a script is larger, it is truncated before execution.

10240 B (10 kB)–102400 B (100 kB)

50000 B

For example: 10240 B, 10240B, 10 kB, 10kB

Maximum size of response body read by post-execution scripts

The maximum number of bytes of the content of a response passed to a post-execution script (cannot be greater than maximum response body size)—if the response body is larger, it is truncated before being passed to the script.

10240 B (10 kB)–1048576 B (1 MB)

50000 B

For example: 10240 B, 10240B, 10 kB, 10kB

Maximum response body size

Maximum size of the response body read by the Synthetic engine for string/regex validation (cannot be less than the maximum size of the response body read by post-execution scripts)

51200 B (50 kB)–20971520 B (20 MB)

10485760 B

For example: 1048576 B, 1048576B, 1024 kB, 1024kB, 1 MB, 1MB