#126: Add client configuration

README.md

@@ -33,6 +33,8 @@ For more details, see [Usage](#usage)
   - [Conditions](#conditions)
     - [Placeholders](#placeholders)
     - [Functions](#functions)
+  - [Storage](#storage)
+  - [Client configuration](#client-configuration)
   - [Alerting](#alerting)
     - [Configuring Slack alerts](#configuring-slack-alerts)
     - [Configuring Discord alerts](#configuring-discord-alerts)
@@ -142,7 +144,6 @@ If you want to test it locally, see [Docker](#docker).
 | `services[].group`                       | Group name. Used to group multiple services together on the dashboard. See [Service groups](#service-groups). | `""`           |
 | `services[].url`                         | URL to send the request to.                                                   | Required `""`  |
 | `services[].method`                      | Request method.                                                               | `GET`          |
-| `services[].insecure`                    | Whether to skip verifying the server's certificate chain and host name.       | `false`        |
 | `services[].conditions`                  | Conditions used to determine the health of the service. See [Conditions](#conditions). | `[]`           |
 | `services[].interval`                    | Duration to wait between every status check.                                  | `60s`          |
 | `services[].graphql`                     | Whether to wrap the body in a query param (`{"query":"$body"}`).              | `false`        |
@@ -157,6 +158,7 @@ If you want to test it locally, see [Docker](#docker).
 | `services[].alerts[].success-threshold`  | Number of successes in a row before an ongoing incident is marked as resolved. | `2`            |
 | `services[].alerts[].send-on-resolved`   | Whether to send a notification once a triggered alert is marked as resolved.  | `false`        |
 | `services[].alerts[].description`        | Description of the alert. Will be included in the alert sent.                 | `""`           |
+| `services[].client`                      | Client configuration. See [Client configuration](#client-configuration).      | `{}`           |
 | `alerting`                               | Configuration for alerting. See [Alerting](#alerting).                        | `{}`           |
 | `security`                               | Security configuration.                                                       | `{}`           |
 | `security.basic`                         | Basic authentication security configuration.                                  | `{}`           |
@@ -238,6 +240,42 @@ storage:
 See [examples/docker-compose-sqlite-storage](examples/docker-compose-sqlite-storage) for an example.
 
 
+### Client configuration
+In order to support a wide range of environments, each monitored service has a unique configuration for 
+the client used to send the request.
+
+| Parameter                | Description                                                                   | Default        |
+|:-------------------------|:----------------------------------------------------------------------------- |:-------------- |
+| `client.insecure`        | Whether to skip verifying the server's certificate chain and host name.       | `false`        |
+| `client.ignore-follow`   | Whether to ignore redirects (true) or follow them (false, default).           | `false`        |
+| `client.timeout`         | Duration before timing out.                                                   | `10s`          |
+
+Note that some of these parameters are ignored based on the type of service. For instance, there's no certificate involved
+in ICMP requests (ping), therefore, setting `client.insecure` to `true` for a service of that type will not do anything.
+
+This default configuration is as follows:
+```yaml
+client:
+  insecure: false
+  ignore-follow: false
+  timeout: 10s
+```
+Note that this configuration is only available under `services[]`, `alerting.mattermost` and `alerting.custom`.
+
+Here's an example with the client configuration under `service[]`:
+```yaml
+services:
+  - name: twinnation
+    url: "https://twinnation.org/health"
+    client:
+      insecure: false
+      ignore-follow: false
+      timeout: 10s
+    conditions:
+      - "[STATUS] == 200"
+```
+
+
 ### Alerting
 Gatus supports multiple alerting providers, such as Slack and PagerDuty, and supports different alerts for each
 individual services with configurable descriptions and thresholds.
@@ -260,7 +298,7 @@ ignored.
 | `alerting.twilio.to`                     | Number to send twilio alerts to                                               | Required `""`  |
 | `alerting.mattermost`                    | Configuration for alerts of type `mattermost`                                 | `{}`           |
 | `alerting.mattermost.webhook-url`        | Mattermost Webhook URL                                                        | Required `""`  |
-| `alerting.mattermost.insecure`           | Whether to skip verifying the server's certificate chain and host name        | `false`        |
+| `alerting.mattermost.client`             | Client configuration. See [Client configuration](#client-configuration).      | `{}`           |
 | `alerting.messagebird`                   | Settings for alerts of type `messagebird`                                     | `{}`           |
 | `alerting.messagebird.access-key`        | Messagebird access key                                                        | Required `""`  |
 | `alerting.messagebird.originator`        | The sender of the message                                                     | Required `""`  |
@@ -271,9 +309,9 @@ ignored.
 | `alerting.custom`                        | Configuration for custom actions on failure or alerts                         | `{}`           |
 | `alerting.custom.url`                    | Custom alerting request url                                                   | Required `""`  |
 | `alerting.custom.method`                 | Request method                                                                | `GET`          |
-| `alerting.custom.insecure`               | Whether to skip verifying the server's certificate chain and host name        | `false`        |
 | `alerting.custom.body`                   | Custom alerting request body.                                                 | `""`           |
 | `alerting.custom.headers`                | Custom alerting request headers                                               | `{}`           |
+| `alerting.custom.client`                 | Client configuration. See [Client configuration](#client-configuration).      | `{}`           |
 | `alerting.*.default-alert.enabled`            | Whether to enable the alert                                                   | N/A       |
 | `alerting.*.default-alert.failure-threshold`  | Number of failures in a row needed before triggering the alert                | N/A       |
 | `alerting.*.default-alert.success-threshold`  | Number of successes in a row before an ongoing incident is marked as resolved | N/A       |
@@ -394,7 +432,8 @@ services:
 alerting:
   mattermost: 
     webhook-url: "http://**********/hooks/**********"
-    insecure: true
+    client:
+      insecure: true
 
 services:
   - name: twinnation
@@ -490,7 +529,6 @@ alerting:
   custom:
     url: "https://hooks.slack.com/services/**********/**********/**********"
     method: "POST"
-    insecure: true
     body: |
       {
         "text": "[ALERT_TRIGGERED_OR_RESOLVED]: [SERVICE_NAME] - [ALERT_DESCRIPTION]"
@@ -739,7 +777,7 @@ such as 1ms. You'll notice that the response time does not fluctuate - that is b
 different goroutines, there's a global lock that prevents multiple services from running at the same time.
 
 Unfortunately, there is a drawback. If you have a lot of services, including some that are very slow or prone to time out (the default
-time out is 10s for HTTP and 5s for TCP), then it means that for the entire duration of the request, no other services can be evaluated.
+timeout is 10s), then it means that for the entire duration of the request, no other services can be evaluated.
 
 **This does mean that Gatus will be unable to evaluate the health of other services**. 
 The interval does not include the duration of the request itself, which means that if a service has an interval of 30s 
@@ -762,11 +800,13 @@ simple health checks used for alerting (PagerDuty/Twilio) to `30s`.
 | Protocol | Timeout |
 |:-------- |:------- |
 | HTTP     | 10s
-| TCP      | 5s
+| TCP      | 10s
+| ICMP     | 10s
+
+To modify the timeout, see [Client configuration](#client-configuration).
 
 
 ### Monitoring a TCP service
-
 By prefixing `services[].url` with `tcp:\\`, you can monitor TCP services at a very basic level:
 
 ```yaml
@@ -1006,4 +1046,3 @@ No such header is required to query the API.
 You can find the full list of sponsors [here](https://github.com/sponsors/TwinProduction).
 
 [<img src="https://github.com/math280h.png" width="35" />](https://github.com/math280h)
-[<img src="https://github.com/mateothegreat.png" width="35" />](https://github.com/mateothegreat)

alerting/provider/custom/custom.go

@@ -5,6 +5,7 @@ import (
 	"errors"
 	"fmt"
 	"io/ioutil"
+	"log"
 	"net/http"
 	"os"
 	"strings"
@@ -19,18 +20,29 @@ import (
 type AlertProvider struct {
 	URL          string                       `yaml:"url"`
 	Method       string                       `yaml:"method,omitempty"`
-	Insecure     bool                         `yaml:"insecure,omitempty"`
+	Insecure     bool                         `yaml:"insecure,omitempty"` // deprecated
 	Body         string                       `yaml:"body,omitempty"`
 	Headers      map[string]string            `yaml:"headers,omitempty"`
 	Placeholders map[string]map[string]string `yaml:"placeholders,omitempty"`
 
+	// ClientConfig is the configuration of the client used to communicate with the provider's target
+	ClientConfig *client.Config `yaml:"client"`
+
 	// DefaultAlert is the default alert configuration to use for services with an alert of the appropriate type
 	DefaultAlert *alert.Alert `yaml:"default-alert"`
 }
 
 // IsValid returns whether the provider's configuration is valid
 func (provider *AlertProvider) IsValid() bool {
-	return len(provider.URL) > 0
+	if provider.ClientConfig == nil {
+		provider.ClientConfig = client.GetDefaultConfig()
+		// XXX: remove the next 3 lines in v3.0.0
+		if provider.Insecure {
+			log.Println("WARNING: alerting.*.insecure has been deprecated and will be removed in v3.0.0 in favor of alerting.*.client.insecure")
+			provider.ClientConfig.Insecure = true
+		}
+	}
+	return len(provider.URL) > 0 && provider.ClientConfig != nil
 }
 
 // ToCustomAlertProvider converts the provider into a custom.AlertProvider
@@ -103,7 +115,7 @@ func (provider *AlertProvider) Send(serviceName, alertDescription string, resolv
 		return []byte("{}"), nil
 	}
 	request := provider.buildHTTPRequest(serviceName, alertDescription, resolved)
-	response, err := client.GetHTTPClient(provider.Insecure).Do(request)
+	response, err := client.GetHTTPClient(provider.ClientConfig).Do(request)
 	if err != nil {
 		return nil, err
 	}

alerting/provider/mattermost/mattermost.go

@@ -2,17 +2,22 @@ package mattermost
 
 import (
 	"fmt"
+	"log"
 	"net/http"
 
 	"github.com/TwinProduction/gatus/alerting/alert"
 	"github.com/TwinProduction/gatus/alerting/provider/custom"
+	"github.com/TwinProduction/gatus/client"
 	"github.com/TwinProduction/gatus/core"
 )
 
 // AlertProvider is the configuration necessary for sending an alert using Mattermost
 type AlertProvider struct {
 	WebhookURL string `yaml:"webhook-url"`
-	Insecure   bool   `yaml:"insecure,omitempty"`
+	Insecure   bool   `yaml:"insecure,omitempty"` // deprecated
+
+	// ClientConfig is the configuration of the client used to communicate with the provider's target
+	ClientConfig *client.Config `yaml:"client"`
 
 	// DefaultAlert is the default alert configuration to use for services with an alert of the appropriate type
 	DefaultAlert *alert.Alert `yaml:"default-alert"`
@@ -20,6 +25,14 @@ type AlertProvider struct {
 
 // IsValid returns whether the provider's configuration is valid
 func (provider *AlertProvider) IsValid() bool {
+	if provider.ClientConfig == nil {
+		provider.ClientConfig = client.GetDefaultConfig()
+		// XXX: remove the next 3 lines in v3.0.0
+		if provider.Insecure {
+			log.Println("WARNING: alerting.mattermost.insecure has been deprecated and will be removed in v3.0.0 in favor of alerting.mattermost.client.insecure")
+			provider.ClientConfig.Insecure = true
+		}
+	}
 	return len(provider.WebhookURL) > 0
 }
 
@@ -45,9 +58,9 @@ func (provider *AlertProvider) ToCustomAlertProvider(service *core.Service, aler
 		results += fmt.Sprintf("%s - `%s`\\n", prefix, conditionResult.Condition)
 	}
 	return &custom.AlertProvider{
-		URL:      provider.WebhookURL,
+		URL:          provider.WebhookURL,
-		Method:   http.MethodPost,
+		Method:       http.MethodPost,
-		Insecure: provider.Insecure,
+		ClientConfig: provider.ClientConfig,
 		Body: fmt.Sprintf(`{
   "text": "",
   "username": "gatus",

client/client.go

@@ -14,58 +14,14 @@ import (
 	"github.com/go-ping/ping"
 )
 
-var (
-	secureHTTPClient   *http.Client
-	insecureHTTPClient *http.Client
-
-	// pingTimeout is the timeout for the Ping function
-	// This is mainly exposed for testing purposes
-	pingTimeout = 5 * time.Second
-
-	// httpTimeout is the timeout for secureHTTPClient and insecureHTTPClient
-	httpTimeout = 10 * time.Second
-)
-
 // GetHTTPClient returns the shared HTTP client
-func GetHTTPClient(insecure bool) *http.Client {
+func GetHTTPClient(config *Config) *http.Client {
-	if insecure {
+	return config.GetHTTPClient()
-		if insecureHTTPClient == nil {
-			insecureHTTPClient = &http.Client{
-				Timeout: httpTimeout,
-				Transport: &http.Transport{
-					MaxIdleConns:        100,
-					MaxIdleConnsPerHost: 20,
-					Proxy:               http.ProxyFromEnvironment,
-					TLSClientConfig: &tls.Config{
-						InsecureSkipVerify: true,
-					},
-				},
-				CheckRedirect: func(req *http.Request, via []*http.Request) error {
-					return http.ErrUseLastResponse // Don't follow redirects
-				},
-			}
-		}
-		return insecureHTTPClient
-	}
-	if secureHTTPClient == nil {
-		secureHTTPClient = &http.Client{
-			Timeout: httpTimeout,
-			Transport: &http.Transport{
-				MaxIdleConns:        100,
-				MaxIdleConnsPerHost: 20,
-				Proxy:               http.ProxyFromEnvironment,
-			},
-			CheckRedirect: func(req *http.Request, via []*http.Request) error {
-				return http.ErrUseLastResponse // Don't follow redirects
-			},
-		}
-	}
-	return secureHTTPClient
 }
 
 // CanCreateTCPConnection checks whether a connection can be established with a TCP service
-func CanCreateTCPConnection(address string) bool {
+func CanCreateTCPConnection(address string, config *Config) bool {
-	conn, err := net.DialTimeout("tcp", address, 5*time.Second)
+	conn, err := net.DialTimeout("tcp", address, config.Timeout)
 	if err != nil {
 		return false
 	}
@@ -74,7 +30,7 @@ func CanCreateTCPConnection(address string) bool {
 }
 
 // CanPerformStartTLS checks whether a connection can be established to an address using the STARTTLS protocol
-func CanPerformStartTLS(address string, insecure bool) (connected bool, certificate *x509.Certificate, err error) {
+func CanPerformStartTLS(address string, config *Config) (connected bool, certificate *x509.Certificate, err error) {
 	hostAndPort := strings.Split(address, ":")
 	if len(hostAndPort) != 2 {
 		return false, nil, errors.New("invalid address for starttls, format must be host:port")
@@ -84,7 +40,7 @@ func CanPerformStartTLS(address string, insecure bool) (connected bool, certific
 		return
 	}
 	err = smtpClient.StartTLS(&tls.Config{
-		InsecureSkipVerify: insecure,
+		InsecureSkipVerify: config.Insecure,
 		ServerName:         hostAndPort[0],
 	})
 	if err != nil {
@@ -101,13 +57,13 @@ func CanPerformStartTLS(address string, insecure bool) (connected bool, certific
 // Ping checks if an address can be pinged and returns the round-trip time if the address can be pinged
 //
 // Note that this function takes at least 100ms, even if the address is 127.0.0.1
-func Ping(address string) (bool, time.Duration) {
+func Ping(address string, config *Config) (bool, time.Duration) {
 	pinger, err := ping.NewPinger(address)
 	if err != nil {
 		return false, 0
 	}
 	pinger.Count = 1
-	pinger.Timeout = pingTimeout
+	pinger.Timeout = config.Timeout
 	// Set the pinger's privileged mode to true for every operating system except darwin
 	// https://github.com/TwinProduction/gatus/issues/132
 	pinger.SetPrivileged(runtime.GOOS != "darwin")

client/client_test.go

@@ -6,43 +6,28 @@ import (
 )
 
 func TestGetHTTPClient(t *testing.T) {
-	if secureHTTPClient != nil {
+	GetHTTPClient(&Config{
-		t.Error("secureHTTPClient should've been nil since it hasn't been called a single time yet")
+		Insecure:       false,
-	}
+		IgnoreRedirect: false,
-	if insecureHTTPClient != nil {
+		Timeout:        0,
-		t.Error("insecureHTTPClient should've been nil since it hasn't been called a single time yet")
+		httpClient:     nil,
-	}
+	})
-	_ = GetHTTPClient(false)
-	if secureHTTPClient == nil {
-		t.Error("secureHTTPClient shouldn't have been nil, since it has been called once")
-	}
-	if insecureHTTPClient != nil {
-		t.Error("insecureHTTPClient should've been nil since it hasn't been called a single time yet")
-	}
-	_ = GetHTTPClient(true)
-	if secureHTTPClient == nil {
-		t.Error("secureHTTPClient shouldn't have been nil, since it has been called once")
-	}
-	if insecureHTTPClient == nil {
-		t.Error("insecureHTTPClient shouldn't have been nil, since it has been called once")
-	}
 }
 
 func TestPing(t *testing.T) {
-	pingTimeout = 500 * time.Millisecond
+	if success, rtt := Ping("127.0.0.1", &Config{Timeout: 500 * time.Millisecond}); !success {
-	if success, rtt := Ping("127.0.0.1"); !success {
 		t.Error("expected true")
 		if rtt == 0 {
 			t.Error("Round-trip time returned on success should've higher than 0")
 		}
 	}
-	if success, rtt := Ping("256.256.256.256"); success {
+	if success, rtt := Ping("256.256.256.256", &Config{Timeout: 500 * time.Millisecond}); success {
 		t.Error("expected false, because the IP is invalid")
 		if rtt != 0 {
 			t.Error("Round-trip time returned on failure should've been 0")
 		}
 	}
-	if success, rtt := Ping("192.168.152.153"); success {
+	if success, rtt := Ping("192.168.152.153", &Config{Timeout: 500 * time.Millisecond}); success {
 		t.Error("expected false, because the IP is valid but the host should be unreachable")
 		if rtt != 0 {
 			t.Error("Round-trip time returned on failure should've been 0")
@@ -88,7 +73,7 @@ func TestCanPerformStartTLS(t *testing.T) {
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			connected, _, err := CanPerformStartTLS(tt.args.address, tt.args.insecure)
+			connected, _, err := CanPerformStartTLS(tt.args.address, &Config{Insecure: tt.args.insecure, Timeout: 5 * time.Second})
 			if (err != nil) != tt.wantErr {
 				t.Errorf("CanPerformStartTLS() err=%v, wantErr=%v", err, tt.wantErr)
 				return
@@ -101,7 +86,7 @@ func TestCanPerformStartTLS(t *testing.T) {
 }
 
 func TestCanCreateTCPConnection(t *testing.T) {
-	if CanCreateTCPConnection("127.0.0.1") {
+	if CanCreateTCPConnection("127.0.0.1", &Config{Timeout: 5 * time.Second}) {
 		t.Error("should've failed, because there's no port in the address")
 	}
 }

client/config.go

@@ -0,0 +1,73 @@
+package client
+
+import (
+	"crypto/tls"
+	"net/http"
+	"time"
+)
+
+const (
+	defaultHTTPTimeout = 10 * time.Second
+)
+
+var (
+	// DefaultConfig is the default client configuration
+	defaultConfig = Config{
+		Insecure:       false,
+		IgnoreRedirect: false,
+		Timeout:        defaultHTTPTimeout,
+	}
+)
+
+// GetDefaultConfig returns a copy of the default configuration
+func GetDefaultConfig() *Config {
+	cfg := defaultConfig
+	return &cfg
+}
+
+// Config is the configuration for clients
+type Config struct {
+	// Insecure determines whether to skip verifying the server's certificate chain and host name
+	Insecure bool `yaml:"insecure"`
+
+	// IgnoreRedirect determines whether to ignore redirects (true) or follow them (false, default)
+	IgnoreRedirect bool `yaml:"ignore-redirect"`
+
+	// Timeout for the client
+	Timeout time.Duration `yaml:"timeout"`
+
+	httpClient *http.Client
+}
+
+// ValidateAndSetDefaults validates the client configuration and sets the default values if necessary
+func (c *Config) ValidateAndSetDefaults() {
+	if c.Timeout < time.Millisecond {
+		c.Timeout = 10 * time.Second
+	}
+}
+
+// GetHTTPClient return a HTTP client matching the Config's parameters.
+func (c *Config) GetHTTPClient() *http.Client {
+	if c.httpClient == nil {
+		c.httpClient = &http.Client{
+			Timeout: c.Timeout,
+			Transport: &http.Transport{
+				MaxIdleConns:        100,
+				MaxIdleConnsPerHost: 20,
+				Proxy:               http.ProxyFromEnvironment,
+				TLSClientConfig: &tls.Config{
+					InsecureSkipVerify: c.Insecure,
+				},
+			},
+			CheckRedirect: func(req *http.Request, via []*http.Request) error {
+				if c.IgnoreRedirect {
+					// Don't follow redirects
+					return http.ErrUseLastResponse
+				}
+				// Follow redirects
+				return nil
+			},
+		}
+	}
+	return c.httpClient
+}

client/config_test.go

@@ -0,0 +1,37 @@
+package client
+
+import (
+	"net/http"
+	"testing"
+	"time"
+)
+
+func TestConfig_GetHTTPClient(t *testing.T) {
+	insecureConfig := &Config{Insecure: true}
+	insecureConfig.ValidateAndSetDefaults()
+	insecureClient := insecureConfig.GetHTTPClient()
+	if !(insecureClient.Transport).(*http.Transport).TLSClientConfig.InsecureSkipVerify {
+		t.Error("expected Config.Insecure set to true to cause the HTTP client to skip certificate verification")
+	}
+	if insecureClient.Timeout != defaultHTTPTimeout {
+		t.Error("expected Config.Timeout to default the HTTP client to a timeout of 10s")
+	}
+	request, _ := http.NewRequest("GET", "", nil)
+	if err := insecureClient.CheckRedirect(request, nil); err != nil {
+		t.Error("expected Config.IgnoreRedirect set to false to cause the HTTP client's CheckRedirect to return nil")
+	}
+
+	secureConfig := &Config{IgnoreRedirect: true, Timeout: 5 * time.Second}
+	secureConfig.ValidateAndSetDefaults()
+	secureClient := secureConfig.GetHTTPClient()
+	if (secureClient.Transport).(*http.Transport).TLSClientConfig.InsecureSkipVerify {
+		t.Error("expected Config.Insecure set to false to cause the HTTP client to not skip certificate verification")
+	}
+	if secureClient.Timeout != 5*time.Second {
+		t.Error("expected Config.Timeout to cause the HTTP client to have a timeout of 5s")
+	}
+	request, _ = http.NewRequest("GET", "", nil)
+	if err := secureClient.CheckRedirect(request, nil); err != http.ErrUseLastResponse {
+		t.Error("expected Config.IgnoreRedirect set to true to cause the HTTP client's CheckRedirect to return http.ErrUseLastResponse")
+	}
+}

config/config_test.go

@@ -16,6 +16,7 @@ import (
 	"github.com/TwinProduction/gatus/alerting/provider/slack"
 	"github.com/TwinProduction/gatus/alerting/provider/telegram"
 	"github.com/TwinProduction/gatus/alerting/provider/twilio"
+	"github.com/TwinProduction/gatus/client"
 	"github.com/TwinProduction/gatus/core"
 	"github.com/TwinProduction/gatus/k8stest"
 	v1 "k8s.io/api/core/v1"
@@ -40,17 +41,31 @@ func TestParseAndValidateConfigBytes(t *testing.T) {
 	config, err := parseAndValidateConfigBytes([]byte(fmt.Sprintf(`
 storage:
   file: %s
+
 services:
   - name: twinnation
     url: https://twinnation.org/health
     interval: 15s
     conditions:
       - "[STATUS] == 200"
+
   - name: github
     url: https://api.github.com/healthz
+    client:
+      insecure: true
+      ignore-redirect: true
+      timeout: 5s
     conditions:
       - "[STATUS] != 400"
       - "[STATUS] != 500"
+
+  - name: example
+    url: https://example.com/
+    interval: 30m
+    client:
+      insecure: true
+    conditions:
+      - "[STATUS] == 200"
 `, file)))
 	if err != nil {
 		t.Error("expected no error, got", err.Error())
@@ -58,33 +73,75 @@ services:
 	if config == nil {
 		t.Fatal("Config shouldn't have been nil")
 	}
-	if len(config.Services) != 2 {
+	if len(config.Services) != 3 {
 		t.Error("Should have returned two services")
 	}
+
 	if config.Services[0].URL != "https://twinnation.org/health" {
 		t.Errorf("URL should have been %s", "https://twinnation.org/health")
 	}
-	if config.Services[1].URL != "https://api.github.com/healthz" {
-		t.Errorf("URL should have been %s", "https://api.github.com/healthz")
-	}
 	if config.Services[0].Method != "GET" {
 		t.Errorf("Method should have been %s (default)", "GET")
 	}
-	if config.Services[1].Method != "GET" {
-		t.Errorf("Method should have been %s (default)", "GET")
-	}
 	if config.Services[0].Interval != 15*time.Second {
 		t.Errorf("Interval should have been %s", 15*time.Second)
 	}
-	if config.Services[1].Interval != 60*time.Second {
+	if config.Services[0].ClientConfig.Insecure != client.GetDefaultConfig().Insecure {
-		t.Errorf("Interval should have been %s, because it is the default value", 60*time.Second)
+		t.Errorf("ClientConfig.Insecure should have been %v, got %v", true, config.Services[0].ClientConfig.Insecure)
+	}
+	if config.Services[0].ClientConfig.IgnoreRedirect != client.GetDefaultConfig().IgnoreRedirect {
+		t.Errorf("ClientConfig.IgnoreRedirect should have been %v, got %v", true, config.Services[0].ClientConfig.IgnoreRedirect)
+	}
+	if config.Services[0].ClientConfig.Timeout != client.GetDefaultConfig().Timeout {
+		t.Errorf("ClientConfig.Timeout should have been %v, got %v", client.GetDefaultConfig().Timeout, config.Services[0].ClientConfig.Timeout)
 	}
 	if len(config.Services[0].Conditions) != 1 {
 		t.Errorf("There should have been %d conditions", 1)
 	}
+
+	if config.Services[1].URL != "https://api.github.com/healthz" {
+		t.Errorf("URL should have been %s", "https://api.github.com/healthz")
+	}
+	if config.Services[1].Method != "GET" {
+		t.Errorf("Method should have been %s (default)", "GET")
+	}
+	if config.Services[1].Interval != 60*time.Second {
+		t.Errorf("Interval should have been %s, because it is the default value", 60*time.Second)
+	}
+	if !config.Services[1].ClientConfig.Insecure {
+		t.Errorf("ClientConfig.Insecure should have been %v, got %v", true, config.Services[1].ClientConfig.Insecure)
+	}
+	if !config.Services[1].ClientConfig.IgnoreRedirect {
+		t.Errorf("ClientConfig.IgnoreRedirect should have been %v, got %v", true, config.Services[1].ClientConfig.IgnoreRedirect)
+	}
+	if config.Services[1].ClientConfig.Timeout != 5*time.Second {
+		t.Errorf("ClientConfig.Timeout should have been %v, got %v", 5*time.Second, config.Services[1].ClientConfig.Timeout)
+	}
 	if len(config.Services[1].Conditions) != 2 {
 		t.Errorf("There should have been %d conditions", 2)
 	}
+
+	if config.Services[2].URL != "https://example.com/" {
+		t.Errorf("URL should have been %s", "https://example.com/")
+	}
+	if config.Services[2].Method != "GET" {
+		t.Errorf("Method should have been %s (default)", "GET")
+	}
+	if config.Services[2].Interval != 30*time.Minute {
+		t.Errorf("Interval should have been %s, because it is the default value", 30*time.Minute)
+	}
+	if !config.Services[2].ClientConfig.Insecure {
+		t.Errorf("ClientConfig.Insecure should have been %v, got %v", true, config.Services[2].ClientConfig.Insecure)
+	}
+	if config.Services[2].ClientConfig.IgnoreRedirect {
+		t.Errorf("ClientConfig.IgnoreRedirect should have been %v by default, got %v", false, config.Services[2].ClientConfig.IgnoreRedirect)
+	}
+	if config.Services[2].ClientConfig.Timeout != 10*time.Second {
+		t.Errorf("ClientConfig.Timeout should have been %v by default, got %v", 10*time.Second, config.Services[2].ClientConfig.Timeout)
+	}
+	if len(config.Services[2].Conditions) != 1 {
+		t.Errorf("There should have been %d conditions", 1)
+	}
 }
 
 func TestParseAndValidateConfigBytesDefault(t *testing.T) {
@@ -104,17 +161,26 @@ services:
 	if config.Metrics {
 		t.Error("Metrics should've been false by default")
 	}
+	if config.Web.Address != DefaultAddress {
+		t.Errorf("Bind address should have been %s, because it is the default value", DefaultAddress)
+	}
+	if config.Web.Port != DefaultPort {
+		t.Errorf("Port should have been %d, because it is the default value", DefaultPort)
+	}
 	if config.Services[0].URL != "https://twinnation.org/health" {
 		t.Errorf("URL should have been %s", "https://twinnation.org/health")
 	}
 	if config.Services[0].Interval != 60*time.Second {
 		t.Errorf("Interval should have been %s, because it is the default value", 60*time.Second)
 	}
-	if config.Web.Address != DefaultAddress {
+	if config.Services[0].ClientConfig.Insecure != client.GetDefaultConfig().Insecure {
-		t.Errorf("Bind address should have been %s, because it is the default value", DefaultAddress)
+		t.Errorf("ClientConfig.Insecure should have been %v by default, got %v", true, config.Services[0].ClientConfig.Insecure)
 	}
-	if config.Web.Port != DefaultPort {
+	if config.Services[0].ClientConfig.IgnoreRedirect != client.GetDefaultConfig().IgnoreRedirect {
-		t.Errorf("Port should have been %d, because it is the default value", DefaultPort)
+		t.Errorf("ClientConfig.IgnoreRedirect should have been %v by default, got %v", true, config.Services[0].ClientConfig.IgnoreRedirect)
+	}
+	if config.Services[0].ClientConfig.Timeout != client.GetDefaultConfig().Timeout {
+		t.Errorf("ClientConfig.Timeout should have been %v by default, got %v", client.GetDefaultConfig().Timeout, config.Services[0].ClientConfig.Timeout)
 	}
 }
 
@@ -143,11 +209,9 @@ services:
 	if config.Services[0].Interval != 60*time.Second {
 		t.Errorf("Interval should have been %s, because it is the default value", 60*time.Second)
 	}
-
 	if config.Web.Address != "127.0.0.1" {
 		t.Errorf("Bind address should have been %s, because it is specified in config", "127.0.0.1")
 	}
-
 	if config.Web.Port != DefaultPort {
 		t.Errorf("Port should have been %d, because it is the default value", DefaultPort)
 	}
@@ -339,6 +403,8 @@ alerting:
     integration-key: "00000000000000000000000000000000"
   mattermost:
     webhook-url: "http://example.com"
+    client:
+      insecure: true
   messagebird:
     access-key: "1"
     originator: "31619191918"
@@ -895,6 +961,9 @@ services:
 	if config.Alerting.Custom.Insecure {
 		t.Fatal("config.Alerting.Custom.Insecure shouldn't have been true")
 	}
+	if config.Alerting.Custom.ClientConfig.Insecure {
+		t.Errorf("ClientConfig.Insecure should have been %v, got %v", false, config.Alerting.Custom.ClientConfig.Insecure)
+	}
 }
 
 func TestParseAndValidateConfigBytesWithCustomAlertingConfigAndCustomPlaceholderValues(t *testing.T) {

controller/controller_test.go

@@ -30,7 +30,6 @@ var (
 		Interval:                30 * time.Second,
 		Conditions:              []*core.Condition{&firstCondition, &secondCondition, &thirdCondition},
 		Alerts:                  nil,
-		Insecure:                false,
 		NumberOfFailuresInARow:  0,
 		NumberOfSuccessesInARow: 0,
 	}

core/service.go

@@ -6,6 +6,7 @@ import (
 	"encoding/json"
 	"errors"
 	"io/ioutil"
+	"log"
 	"net"
 	"net/http"
 	"net/url"
@@ -78,8 +79,13 @@ type Service struct {
 	Alerts []*alert.Alert `yaml:"alerts"`
 
 	// Insecure is whether to skip verifying the server's certificate chain and host name
+	//
+	// deprecated
 	Insecure bool `yaml:"insecure,omitempty"`
 
+	// ClientConfig is the configuration of the client used to communicate with the service's target
+	ClientConfig *client.Config `yaml:"client"`
+
 	// NumberOfFailuresInARow is the number of unsuccessful evaluations in a row
 	NumberOfFailuresInARow int
 
@@ -90,6 +96,16 @@ type Service struct {
 // ValidateAndSetDefaults validates the service's configuration and sets the default value of fields that have one
 func (service *Service) ValidateAndSetDefaults() error {
 	// Set default values
+	if service.ClientConfig == nil {
+		service.ClientConfig = client.GetDefaultConfig()
+		// XXX: remove the next 3 lines in v3.0.0
+		if service.Insecure {
+			log.Println("WARNING: services[].insecure has been deprecated and will be removed in v3.0.0 in favor of services[].client.insecure")
+			service.ClientConfig.Insecure = true
+		}
+	} else {
+		service.ClientConfig.ValidateAndSetDefaults()
+	}
 	if service.Interval == 0 {
 		service.Interval = 1 * time.Minute
 	}
@@ -199,7 +215,7 @@ func (service *Service) call(result *Result) {
 		service.DNS.query(service.URL, result)
 		result.Duration = time.Since(startTime)
 	} else if isServiceStartTLS {
-		result.Connected, certificate, err = client.CanPerformStartTLS(strings.TrimPrefix(service.URL, "starttls://"), service.Insecure)
+		result.Connected, certificate, err = client.CanPerformStartTLS(strings.TrimPrefix(service.URL, "starttls://"), service.ClientConfig)
 		if err != nil {
 			result.AddError(err.Error())
 			return
@@ -207,12 +223,12 @@ func (service *Service) call(result *Result) {
 		result.Duration = time.Since(startTime)
 		result.CertificateExpiration = time.Until(certificate.NotAfter)
 	} else if isServiceTCP {
-		result.Connected = client.CanCreateTCPConnection(strings.TrimPrefix(service.URL, "tcp://"))
+		result.Connected = client.CanCreateTCPConnection(strings.TrimPrefix(service.URL, "tcp://"), service.ClientConfig)
 		result.Duration = time.Since(startTime)
 	} else if isServiceICMP {
-		result.Connected, result.Duration = client.Ping(strings.TrimPrefix(service.URL, "icmp://"))
+		result.Connected, result.Duration = client.Ping(strings.TrimPrefix(service.URL, "icmp://"), service.ClientConfig)
 	} else {
-		response, err = client.GetHTTPClient(service.Insecure).Do(request)
+		response, err = client.GetHTTPClient(service.ClientConfig).Do(request)
 		result.Duration = time.Since(startTime)
 		if err != nil {
 			result.AddError(err.Error())

core/service_test.go

@@ -7,6 +7,7 @@ import (
 	"time"
 
 	"github.com/TwinProduction/gatus/alerting/alert"
+	"github.com/TwinProduction/gatus/client"
 )
 
 func TestService_ValidateAndSetDefaults(t *testing.T) {
@@ -18,6 +19,19 @@ func TestService_ValidateAndSetDefaults(t *testing.T) {
 		Alerts:     []*alert.Alert{{Type: alert.TypePagerDuty}},
 	}
 	service.ValidateAndSetDefaults()
+	if service.ClientConfig == nil {
+		t.Error("client configuration should've been set to the default configuration")
+	} else {
+		if service.ClientConfig.Insecure != client.GetDefaultConfig().Insecure {
+			t.Errorf("Default client configuration should've set Insecure to %v, got %v", client.GetDefaultConfig().Insecure, service.ClientConfig.Insecure)
+		}
+		if service.ClientConfig.IgnoreRedirect != client.GetDefaultConfig().IgnoreRedirect {
+			t.Errorf("Default client configuration should've set IgnoreRedirect to %v, got %v", client.GetDefaultConfig().IgnoreRedirect, service.ClientConfig.IgnoreRedirect)
+		}
+		if service.ClientConfig.Timeout != client.GetDefaultConfig().Timeout {
+			t.Errorf("Default client configuration should've set Timeout to %v, got %v", client.GetDefaultConfig().Timeout, service.ClientConfig.Timeout)
+		}
+	}
 	if service.Method != "GET" {
 		t.Error("Service method should've defaulted to GET")
 	}
@@ -41,6 +55,34 @@ func TestService_ValidateAndSetDefaults(t *testing.T) {
 	}
 }
 
+func TestService_ValidateAndSetDefaultsWithClientConfig(t *testing.T) {
+	condition := Condition("[STATUS] == 200")
+	service := Service{
+		Name:       "twinnation-health",
+		URL:        "https://twinnation.org/health",
+		Conditions: []*Condition{&condition},
+		ClientConfig: &client.Config{
+			Insecure:       true,
+			IgnoreRedirect: true,
+			Timeout:        0,
+		},
+	}
+	service.ValidateAndSetDefaults()
+	if service.ClientConfig == nil {
+		t.Error("client configuration should've been set to the default configuration")
+	} else {
+		if !service.ClientConfig.Insecure {
+			t.Error("service.ClientConfig.Insecure should've been set to true")
+		}
+		if !service.ClientConfig.IgnoreRedirect {
+			t.Error("service.ClientConfig.IgnoreRedirect should've been set to true")
+		}
+		if service.ClientConfig.Timeout != client.GetDefaultConfig().Timeout {
+			t.Error("service.ClientConfig.Timeout should've been set to 10s, because the timeout value entered is not set or invalid")
+		}
+	}
+}
+
 func TestService_ValidateAndSetDefaultsWithNoName(t *testing.T) {
 	defer func() { recover() }()
 	condition := Condition("[STATUS] == 200")
@@ -205,6 +247,7 @@ func TestIntegrationEvaluateHealth(t *testing.T) {
 		URL:        "https://twinnation.org/health",
 		Conditions: []*Condition{&condition, &bodyCondition},
 	}
+	service.ValidateAndSetDefaults()
 	result := service.EvaluateHealth()
 	if !result.ConditionResults[0].Success {
 		t.Errorf("Condition '%s' should have been a success", condition)
@@ -224,6 +267,7 @@ func TestIntegrationEvaluateHealthWithFailure(t *testing.T) {
 		URL:        "https://twinnation.org/health",
 		Conditions: []*Condition{&condition},
 	}
+	service.ValidateAndSetDefaults()
 	result := service.EvaluateHealth()
 	if result.ConditionResults[0].Success {
 		t.Errorf("Condition '%s' should have been a failure", condition)
@@ -248,6 +292,7 @@ func TestIntegrationEvaluateHealthForDNS(t *testing.T) {
 		},
 		Conditions: []*Condition{&conditionSuccess, &conditionBody},
 	}
+	service.ValidateAndSetDefaults()
 	result := service.EvaluateHealth()
 	if !result.ConditionResults[0].Success {
 		t.Errorf("Conditions '%s' and %s should have been a success", conditionSuccess, conditionBody)
@@ -267,6 +312,7 @@ func TestIntegrationEvaluateHealthForICMP(t *testing.T) {
 		URL:        "icmp://127.0.0.1",
 		Conditions: []*Condition{&conditionSuccess},
 	}
+	service.ValidateAndSetDefaults()
 	result := service.EvaluateHealth()
 	if !result.ConditionResults[0].Success {
 		t.Errorf("Conditions '%s' should have been a success", conditionSuccess)