diff --git a/client/deployment_get.go b/client/deployment_get.go
index 1e8ab81f..eb63e79c 100644
--- a/client/deployment_get.go
+++ b/client/deployment_get.go
@@ -4,7 +4,6 @@ import (
 	"context"
 	"fmt"
 	"net/http"
-	"strings"
 
 	"github.com/hashicorp/terraform-plugin-log/tflog"
 )
@@ -19,7 +18,7 @@ func (c *Client) GetDeployment(ctx context.Context, deploymentID, teamID string)
 		ctx,
 		"GET",
 		url,
-		strings.NewReader(""),
+		nil,
 	)
 	if err != nil {
 		return r, err
diff --git a/client/environment_variables_delete.go b/client/environment_variables_delete.go
index b67048ab..8966f6d2 100644
--- a/client/environment_variables_delete.go
+++ b/client/environment_variables_delete.go
@@ -4,7 +4,6 @@ import (
 	"context"
 	"fmt"
 	"net/http"
-	"strings"
 
 	"github.com/hashicorp/terraform-plugin-log/tflog"
 )
@@ -19,7 +18,7 @@ func (c *Client) DeleteEnvironmentVariable(ctx context.Context, projectID, teamI
 		ctx,
 		"DELETE",
 		url,
-		strings.NewReader(""),
+		nil,
 	)
 	if err != nil {
 		return err
diff --git a/client/environment_variables_get.go b/client/environment_variables_get.go
index 5e48bfdb..c082b0ad 100644
--- a/client/environment_variables_get.go
+++ b/client/environment_variables_get.go
@@ -4,7 +4,6 @@ import (
 	"context"
 	"fmt"
 	"net/http"
-	"strings"
 
 	"github.com/hashicorp/terraform-plugin-log/tflog"
 )
@@ -18,7 +17,7 @@ func (c *Client) getEnvironmentVariables(ctx context.Context, projectID, teamID
 		ctx,
 		"GET",
 		url,
-		strings.NewReader(""),
+		nil,
 	)
 	if err != nil {
 		return nil, err
diff --git a/client/file_create.go b/client/file_create.go
index e39e4d55..6f42af80 100644
--- a/client/file_create.go
+++ b/client/file_create.go
@@ -23,6 +23,7 @@ func (c *Client) CreateFile(ctx context.Context, filename, sha, content string)
 	}
 
 	req.Header.Add("x-vercel-digest", sha)
+	req.Header.Set("Content-Type", "application/octet-stream")
 
 	tflog.Trace(ctx, "uploading file", map[string]interface{}{
 		"url":     url,
diff --git a/client/project_delete.go b/client/project_delete.go
index cc475629..a1f3b94c 100644
--- a/client/project_delete.go
+++ b/client/project_delete.go
@@ -4,7 +4,6 @@ import (
 	"context"
 	"fmt"
 	"net/http"
-	"strings"
 
 	"github.com/hashicorp/terraform-plugin-log/tflog"
 )
@@ -20,7 +19,7 @@ func (c *Client) DeleteProject(ctx context.Context, projectID, teamID string) er
 		ctx,
 		"DELETE",
 		url,
-		strings.NewReader(""),
+		nil,
 	)
 	if err != nil {
 		return err
diff --git a/client/project_domain_delete.go b/client/project_domain_delete.go
index 576aaa65..cf89ba03 100644
--- a/client/project_domain_delete.go
+++ b/client/project_domain_delete.go
@@ -4,7 +4,6 @@ import (
 	"context"
 	"fmt"
 	"net/http"
-	"strings"
 
 	"github.com/hashicorp/terraform-plugin-log/tflog"
 )
@@ -20,7 +19,7 @@ func (c *Client) DeleteProjectDomain(ctx context.Context, projectID, domain, tea
 		ctx,
 		"DELETE",
 		url,
-		strings.NewReader(""),
+		nil,
 	)
 	if err != nil {
 		return err
diff --git a/client/project_domain_get.go b/client/project_domain_get.go
index 4793cd68..3cb2d863 100644
--- a/client/project_domain_get.go
+++ b/client/project_domain_get.go
@@ -4,7 +4,6 @@ import (
 	"context"
 	"fmt"
 	"net/http"
-	"strings"
 
 	"github.com/hashicorp/terraform-plugin-log/tflog"
 )
@@ -30,7 +29,7 @@ func (c *Client) GetProjectDomain(ctx context.Context, projectID, domain, teamID
 		ctx,
 		"GET",
 		url,
-		strings.NewReader(""),
+		nil,
 	)
 	if err != nil {
 		return r, err
diff --git a/client/project_get.go b/client/project_get.go
index 9b7bd1e5..26ff4b23 100644
--- a/client/project_get.go
+++ b/client/project_get.go
@@ -4,7 +4,6 @@ import (
 	"context"
 	"fmt"
 	"net/http"
-	"strings"
 
 	"github.com/hashicorp/terraform-plugin-log/tflog"
 )
@@ -77,7 +76,7 @@ func (c *Client) GetProject(ctx context.Context, projectID, teamID string) (r Pr
 		ctx,
 		"GET",
 		url,
-		strings.NewReader(""),
+		nil,
 	)
 	if err != nil {
 		return r, err
diff --git a/client/project_list.go b/client/project_list.go
index 56ef7b54..fd7aab48 100644
--- a/client/project_list.go
+++ b/client/project_list.go
@@ -4,7 +4,6 @@ import (
 	"context"
 	"fmt"
 	"net/http"
-	"strings"
 
 	"github.com/hashicorp/terraform-plugin-log/tflog"
 )
@@ -20,7 +19,7 @@ func (c *Client) ListProjects(ctx context.Context, teamID string) (r []ProjectRe
 		ctx,
 		"GET",
 		url,
-		strings.NewReader(""),
+		nil,
 	)
 	if err != nil {
 		return r, err
diff --git a/client/request.go b/client/request.go
index e678b1b6..1a13f505 100644
--- a/client/request.go
+++ b/client/request.go
@@ -22,10 +22,15 @@ func (e APIError) Error() string {
 
 // doRequest is a helper function for consistently requesting data from vercel.
 // This manages:
+// - Setting the default Content-Type for requests with a body
 // - Authorization via the Bearer token
 // - Converting error responses into an inspectable type
 // - Unmarshaling responses
 func (c *Client) doRequest(req *http.Request, v interface{}) error {
+	if req.Body != nil && req.Header.Get("Content-Type") == "" {
+		req.Header.Set("Content-Type", "application/json")
+	}
+
 	req.Header.Add("Authorization", fmt.Sprintf("Bearer %s", c.token))
 	resp, err := c.http().Do(req)
 	if err != nil {
diff --git a/client/team_delete.go b/client/team_delete.go
index bcb01ec6..163a7cb0 100644
--- a/client/team_delete.go
+++ b/client/team_delete.go
@@ -4,7 +4,6 @@ import (
 	"context"
 	"fmt"
 	"net/http"
-	"strings"
 
 	"github.com/hashicorp/terraform-plugin-log/tflog"
 )
@@ -16,7 +15,7 @@ func (c *Client) DeleteTeam(ctx context.Context, teamID string) error {
 		ctx,
 		"DELETE",
 		url,
-		strings.NewReader(""),
+		nil,
 	)
 	if err != nil {
 		return err
diff --git a/client/team_get.go b/client/team_get.go
index 82626cf9..1503f29d 100644
--- a/client/team_get.go
+++ b/client/team_get.go
@@ -4,7 +4,6 @@ import (
 	"context"
 	"fmt"
 	"net/http"
-	"strings"
 
 	"github.com/hashicorp/terraform-plugin-log/tflog"
 )
@@ -21,7 +20,7 @@ func (c *Client) GetTeam(ctx context.Context, teamID, slug string) (r TeamRespon
 		ctx,
 		"GET",
 		url,
-		strings.NewReader(""),
+		nil,
 	)
 	if err != nil {
 		return r, err